subject:(VISUAL ACUITY)

University of Waterloo

1. Hathibelagal, Amithavikram. Objective assessment of Visual acuity in infants.

Degree: 2013, University of Waterloo

► Purpose Early detection of abnormal visual acuity (VA) is crucial in the identification and management of ocular and visual abnormalities in infants. Currently, the Teller… (more)

▼ Purpose Early detection of abnormal visual acuity (VA) is crucial in the identification and management of ocular and visual abnormalities in infants. Currently, the Teller Acuity Cards (TACs) are considered the gold standard for clinical testing and are effective in obtaining a quick estimate of an infant’s VA, but they have certain drawbacks. They rely on a subjective assessment of the baby’s looking behavior. Despite this, TACs have been found to have good validity and repeatability. The current study investigates a new method to objectively assess visual acuity in infants, which is uses a video gaze tracker (GT) and computer-generated stimuli, developed in the lab of M. Eizenman at the University of Toronto. The purpose was to validate this method in adults and infants against current clinical VA tests. Visual scanning patterns were measured by the GT system that requires minimal subject cooperation in adult and infant populations. The targets were judged as seen when the relative fixation time on the grating exceeded a pre-determined threshold, as compared to the fixation time on the luminance-matched background. Methods Experiment 1: In 15 uncorrected myopic adults, binocular grating VA was measured. The targets were square-wave gratings of spatial frequency ranging from 2.3 to 37 cpd presented randomly in one of four positions on the screen. There were 6 objective protocols (in which VA was judged by fixations). The subjects were naïve, as the only instruction given to the participants was to look towards the screen. The experimenter, who presented the gratings also acted as an observer by making judgments of seen/not seen responses using the objective information provided by the software. Objective GT VA was compared with VA measured with subjective responses using the same stimuli and with Teller Acuity Cards (TACs). Experiment 2: Binocular grating VA for horizontal gratings was measured in 20 typically-developing infants aged 3 to 12 months. Spatial frequency ranged from 0.32 to 42 cpd and VA was measured on two visits with both the GT and TACs. A staircase protocol was used to obtain the VA threshold in the GT. The experimenter controlled the staircase method and an observer used the objective information of visual fixations using the software to judge if the grating was seen or not. Video cartoons were shown between stimulus presentations to keep the infant’s attention towards the screen. VA was also measured with the TACs held in the vertical orientation, so that the gratings were horizontal, similar to the GT method. A TAC stage was specially designed with a vertical slot in which the cards could be presented. The observer was masked regarding the participant’s age and the starting spatial frequency. The study co-ordinator determined the choice of the start card which was randomized between participants so as to give an equal number of participants with each start card. The same start card was used for the second session of each infant. The threshold was defined as the highest spatial…

Subjects/Keywords: visual acuity; infants; gaze tracking

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APA (6^th Edition):

Hathibelagal, A. (2013). Objective assessment of Visual acuity in infants. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7681

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hathibelagal, Amithavikram. “Objective assessment of Visual acuity in infants.” 2013. Thesis, University of Waterloo. Accessed January 18, 2021. http://hdl.handle.net/10012/7681.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hathibelagal, Amithavikram. “Objective assessment of Visual acuity in infants.” 2013. Web. 18 Jan 2021.

Vancouver:

Hathibelagal A. Objective assessment of Visual acuity in infants. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10012/7681.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hathibelagal A. Objective assessment of Visual acuity in infants. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7681

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan State University

2. Miller, James Woodell, 1927-. The effect on visual acuity of ocular pursuit during rotation and its subsequent relation to target illumination.

Degree: PhD, 1956, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:5580

Subjects/Keywords: Visual acuity

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APA (6^th Edition):

Miller, James Woodell, 1. (1956). The effect on visual acuity of ocular pursuit during rotation and its subsequent relation to target illumination. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:5580

Chicago Manual of Style (16^th Edition):

Miller, James Woodell, 1927-. “The effect on visual acuity of ocular pursuit during rotation and its subsequent relation to target illumination.” 1956. Doctoral Dissertation, Michigan State University. Accessed January 18, 2021. http://etd.lib.msu.edu/islandora/object/etd:5580.

MLA Handbook (7^th Edition):

Miller, James Woodell, 1927-. “The effect on visual acuity of ocular pursuit during rotation and its subsequent relation to target illumination.” 1956. Web. 18 Jan 2021.

Vancouver:

Miller, James Woodell 1. The effect on visual acuity of ocular pursuit during rotation and its subsequent relation to target illumination. [Internet] [Doctoral dissertation]. Michigan State University; 1956. [cited 2021 Jan 18]. Available from: http://etd.lib.msu.edu/islandora/object/etd:5580.

Council of Science Editors:

Miller, James Woodell 1. The effect on visual acuity of ocular pursuit during rotation and its subsequent relation to target illumination. [Doctoral Dissertation]. Michigan State University; 1956. Available from: http://etd.lib.msu.edu/islandora/object/etd:5580

University of Waterloo

3. Alabdulkader, Balsam. Development of an Arabic Continuous Text Near Acuity Chart.

Degree: 2017, University of Waterloo

URL: http://hdl.handle.net/10012/11725

► Purpose: Near visual acuity is an essential measurement during an oculo-visual assessment. Continuous text near visual acuity charts measure reading acuity and other aspects of… (more)

▼ Purpose: Near visual acuity is an essential measurement during an oculo-visual assessment. Continuous text near visual acuity charts measure reading acuity and other aspects of reading performance. Arabic is ranked as the fourth spoken language globally. Yet, there are no standardized continuous text near visual acuity charts in Arabic. The aims of this study are to create and compose a large pool of standardized sentences, to validate these sentences in children and adults and choose a final set with equal readability to use in the development of a standardized Arabic continuous text reading chart, and then to design and validate the first standardized Arabic continuous text near visual acuity chart, the Balsam Alabdulkader-Leat (BAL) chart. Methods: Initially, 90 Arabic pairs of sentences were created for use in constructing a chart with similar layout to the Colenbrander chart. They were created following accepted criteria for creating sentences for near visual acuity charts. They had the same grade level of difficulty and physical length. Fifty-three Arabic-speaking adults and sixteen children were recruited to validate the sentences. Reading speed in correct words per minute (CWPM) and standard length words per minute (SLWPM) were measured and errors were counted. Elimination criteria based on reading speed and errors made in each sentence pair were applied to exclude sentence pairs with more outlying characteristics, and to select the final group of sentence pairs. The final sub-set of validated sentences was used in the construction of three versions of the BAL chart. Eighty-six bilingual adults with normal vision aged 15 to 59 years were recruited to validate the charts. Reading acuity and reading speed in standard words per minute were measured for the three versions of the BAL chart and three English charts (MNREAD, Colenbrander, and Radner charts). The Arabic version of the IReST chart was used to test the validity of the BAL chart in measuring reading speed. ANOVA was used to compare reading acuity and reading speed in standard words per minute. Bland-Altman plots were used to analyze agreement between the charts. Normal visual acuity (0.00 logMAR) was calibrated for the BAL chart with linear regression between the reading acuity of the BAL chart against reading acuity measured with the MNREAD and the Radner charts. Results: Forty-five sentence pairs were selected according to the elimination criteria. For adults, the average reading speed for the final sentences was 166 CWPM and 187 SLWPM and the average number of errors per sentence pair was 0.21. Childrens’ average reading speed for the final group of sentences was 61 CWPM and 64 SLWPM. Their average error rate was 1.71. The Cronbach’s alpha for the final set of sentence pairs in CWPM and SLWPM was 0.986 for adults and 0.996 for children, showing that the final sentences had very good internal consistency. Three versions of the BAL chart were created. Each chart had fifteen print size levels. Average reading acuity for BAL1, BAL2 and BAL3 was…

Subjects/Keywords: visual acuity; near visual acuity; Arabic; reading; reading acuity; reading speed; BAL chart; near visual acuity chart

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APA (6^th Edition):

Alabdulkader, B. (2017). Development of an Arabic Continuous Text Near Acuity Chart. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/11725

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alabdulkader, Balsam. “Development of an Arabic Continuous Text Near Acuity Chart.” 2017. Thesis, University of Waterloo. Accessed January 18, 2021. http://hdl.handle.net/10012/11725.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alabdulkader, Balsam. “Development of an Arabic Continuous Text Near Acuity Chart.” 2017. Web. 18 Jan 2021.

Vancouver:

Alabdulkader B. Development of an Arabic Continuous Text Near Acuity Chart. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10012/11725.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alabdulkader B. Development of an Arabic Continuous Text Near Acuity Chart. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/11725

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

4. Alkanhal, Norah. Development of Form Visual Acuity in Infants Measured by Schematic Faces.

Degree: 2018, University of Waterloo

URL: http://hdl.handle.net/10012/13981

► Purpose The purpose of this thesis was 1) to develop a test of visual acuity (VA) to measure recognition (form) acuity at a younger age… (more)

▼ Purpose The purpose of this thesis was 1) to develop a test of visual acuity (VA) to measure recognition (form) acuity at a younger age than is currently clinically possible (3 years). Currently, it is only possible to measure resolution (grating) VA in this age group. 2) To validate infant’s recognition VA tests against gold standard ETDRS VA in adults. 3) To test the feasibility of using infant’s recognition VA tests to measure VA in infants 16 - 42 months of age in terms of the testability and ability to measure VA. Methods Preliminary study 1 – Development of Face targets: Adults participated and visual acuity for various versions of face targets were tested under blur in comparison to ETDRS or Tumbling E optotypes. The face targets were successively modified in six trials until the optimal agreement with ETDRS and Snellen Tumbling Es was obtained. Preliminary study 2 (Infants aged 3-15 months): In experiment 1, suprathreshold pairs of targets consisting of happy faces vs scrambled faces or happy faces vs dotted-target were presented either on preferential looking cards or on a computer screen with a non-contact gaze tracker. Percent accurate fixation towards the face compared to the non-face was observed by a naïve observer. In a second phase, habituation for the non-face stimuli were used in which the non-face target was presented twice before each face/non-face pair. Validation study (adults): A series of acuity cards with logarithmic progression in spacing and size (1.3 to -0.1 logMAR) designed for a 60 cm test distance was created. The Face Cards had a smiley face and a dotted target as optotypes. Patti Pics Cards used the house and the circle. Recognition VA was measured with Face Cards, Patti Pics Cards, and near ETDRS chart monocularly, in a counter-balanced order under 3 conditions of optical blur; +4.00D, +2.50D and no blur. Feasibility study (infants aged 16-42 months): Testability and form VA threshold were measured in infants on 2 visits using the Face Cards and Patti Pics Cards in a counter-balanced order. After initial training to point at the target stimulus (face or house), testability was measured using 30M target size with 3/4 correct responses as the criterion to be considered testable. If the infant was testable, two alternative forced choice VA measurement followed using a two down one up staircase procedure. For reference, testability for matching with the Patti Pics and VA with the Cardiff cards were measured. Results Preliminary study 1 – Development of Face targets: The modified border simple face was chosen as most suitable in terms of its apparent appeal as a face and similar results to ETDRS and tumbling Es. Preliminary study 2: Infants aged 3-15 months Eight infants took part in Phase 1 (median age 10.5 months, range 8.5 – 14 months). The percentage of correct looks with the eye tracker was not significantly different from 50% with either the cards or the eye tracker. Eleven infants participated in Phase 2 (median age 11.5 months, range 3.5 – 15 months). Percent…

Subjects/Keywords: Visual Acuity; Pediatric Optometry; Visual Development

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alkanhal, N. (2018). Development of Form Visual Acuity in Infants Measured by Schematic Faces. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/13981

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alkanhal, Norah. “Development of Form Visual Acuity in Infants Measured by Schematic Faces.” 2018. Thesis, University of Waterloo. Accessed January 18, 2021. http://hdl.handle.net/10012/13981.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alkanhal, Norah. “Development of Form Visual Acuity in Infants Measured by Schematic Faces.” 2018. Web. 18 Jan 2021.

Vancouver:

Alkanhal N. Development of Form Visual Acuity in Infants Measured by Schematic Faces. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10012/13981.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alkanhal N. Development of Form Visual Acuity in Infants Measured by Schematic Faces. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/13981

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

5. Carvalho, Fabio Alves. A influência do contraste na hiperacuidade Vernier medida em humanos através do potencial visual provocado e as contribuições das vias retino-geniculadas para o processamento desta informação no córtex visual primário.

Degree: Mestrado, Psicologia Experimental, 2011, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/47/47132/tde-21072011-162506/ ;

► O estudo da acuidade Vernier (VRN) revela a capacidade do sistema visual humano em detectar deslocamentos espaciais de poucos arcos de segundos, menores que a… (more)

▼ O estudo da acuidade Vernier (VRN) revela a capacidade do sistema visual humano em detectar deslocamentos espaciais de poucos arcos de segundos, menores que a distância entre dois cones foveais adjacentes. Tal fato desperta interesse teórico sobre o tema, além de futuras aplicações na área clínica. A acuidade VRN pode ser medida tanto psicofisicamente quanto eletrofisiologicamente. Para a detecção de quebras de colinearidade (acuidade VRN), alguns autores hipotetizam que as células ganglionares (CGs) M da retina provêem sinal adequado da retina ao córtex, e dão suporte ao desempenho psicofísico da tarefa VRN. Em condições de estímulos semelhantes, as células ganglionares magnocelulares (M) em primatas parecem ter precisão espacial com razão sinal-ruído mais alta do que as células parvocelulares (P) . A dependência ao contraste (C) das células M na precisão espacial, frequência espacial, frequência temporal e velocidade do estímulo é mais similar ao desempenho psicofísico em humanos do que comparados aos dados das células P (Rüttiger et al., 2002; Sun et al., 2004). Nós utilizamos o Potencial Provocado Cortical Visual de Varredura (sVEP) para avaliar esta hipótese no nível de processamento intermediário entre as respostas de célula única na retina e a detecção psicofísica. Nós medimos os limiares corticais VRN em função do contraste (14 participantes, média de 28,21 ± 2,8) e lacunas (9 participantes, média de 29,7 ± 5,9). As quebras verticais VRN na colinearidade foram introduzidas em uma grade de onda quadrada horizontal. O estímulo VRN alternou entre um estado alinhado (grades sem quebras) e desalinhado (grades com quebras) a 6 Hz. Durante cada uma das 10 tentativas, o deslocamento aumentou em passos logarítmicos iguais de 0,5 a 7,5. O limiar VRN foi definido no momento do deslocamento em que a extrapolação linear da média vetorial das respostas em 1F atinge zero uV. Os contrastes testados foram: 4, 8, 16, 32, 64, 80%. Os resultados mostram que (1) aos limiares VRN em Log, medidos com sVEP, com o C em Log, diminuíram de forma linear (com uma inclinação de -0,5), similiares às células ganglionares M mas não P (Sun et al., 2004) e próximo às medidas psicofísicas (Sun et al., 2004; Wehrhahn e Westheimer, 1990); (2) Para C 16% obtivemos limiares de hiperacuidade (menor que 1 arcmin). Em altos contrastes a média do limiar foi de 0,37(erro padrão de 0,06 unidades logarítmicas); (3) Os limiares para o 2F tiveram uma dependência para o contraste diferente, com poucos efeitos para contraste abaixo de 16%. (4) As inclinações das linhas de extrapolação dos sVEP para o 1F1 foram 2 a 3 vezes maiores que as inclinações para 2F; (5) No protocolo controle, deslocamentos bidirecionais e simétricos geraram somente respostas no 2F. Os resultados 3 a 5 implicam que os componentes 1F e 2F derivam de neurônios distintos e fundamentam que respostas no 2F refletem respostas de movimento cortical simétrico. A dependência dos limiares de contraste do sVEP VRN (1F) é similiar aos estudos prévios psicofísicos (Sun et al., 2004; Wehrhahn e… Advisors/Committee Members: Hamer, Russell David.

Subjects/Keywords: Acuidade visual; Córtex visual; Electrophysiology; Eletrofisiologia; Visual acuity; Visual cortex

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Carvalho, F. A. (2011). A influência do contraste na hiperacuidade Vernier medida em humanos através do potencial visual provocado e as contribuições das vias retino-geniculadas para o processamento desta informação no córtex visual primário. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/47/47132/tde-21072011-162506/ ;

Chicago Manual of Style (16^th Edition):

Carvalho, Fabio Alves. “A influência do contraste na hiperacuidade Vernier medida em humanos através do potencial visual provocado e as contribuições das vias retino-geniculadas para o processamento desta informação no córtex visual primário.” 2011. Masters Thesis, University of São Paulo. Accessed January 18, 2021. http://www.teses.usp.br/teses/disponiveis/47/47132/tde-21072011-162506/ ;.

MLA Handbook (7^th Edition):

Carvalho, Fabio Alves. “A influência do contraste na hiperacuidade Vernier medida em humanos através do potencial visual provocado e as contribuições das vias retino-geniculadas para o processamento desta informação no córtex visual primário.” 2011. Web. 18 Jan 2021.

Vancouver:

Carvalho FA. A influência do contraste na hiperacuidade Vernier medida em humanos através do potencial visual provocado e as contribuições das vias retino-geniculadas para o processamento desta informação no córtex visual primário. [Internet] [Masters thesis]. University of São Paulo; 2011. [cited 2021 Jan 18]. Available from: http://www.teses.usp.br/teses/disponiveis/47/47132/tde-21072011-162506/ ;.

Council of Science Editors:

Carvalho FA. A influência do contraste na hiperacuidade Vernier medida em humanos através do potencial visual provocado e as contribuições das vias retino-geniculadas para o processamento desta informação no córtex visual primário. [Masters Thesis]. University of São Paulo; 2011. Available from: http://www.teses.usp.br/teses/disponiveis/47/47132/tde-21072011-162506/ ;

University of Johannesburg

6. Moore, Linda A. The subjective and objective effects of tinted spectacle lenses on visual performance.

Degree: 2012, University of Johannesburg

URL: http://hdl.handle.net/10210/6056

►

M.Phil.

Tinted spectacle lenses have long been worn to provide ocular protection from harmful electromagnetic radiation during recreational activities. Controversy exists surrounding the colour of… (more)

▼

M.Phil.

Tinted spectacle lenses have long been worn to provide ocular protection from harmful electromagnetic radiation during recreational activities. Controversy exists surrounding the colour of the spectacle tints and the environmental conditions under which these tints are worn. There is little scientific evidence to substantiate the many opinions of authors on the effects of tinted spectacle lenses on visual skills and, ultimately, on overall performance in recreational situations. This study serves to provide scientific data concerning the effects of tinted lenses on static visual acuity, contrast sensitivity, colour vision, stereopsis and visual evoked potential (VEP). These results are related to the visible spectrum transmission curve for each experimental lens. recommendations are then made concerning the environmental conditions under which each lens tint should be worn. The HOYA ULT-2000 Light Transmission Metre was used to establish the percentage of visible light being transmitted through each of the experimental lenses. The DMS 80/90 Visible Spectrophotometer was used to generate a visible spectrum transmission curve for each of the 8 experimental lenses used in this study. 30 subjects (Group A) were randomly selected from the RAU student population for the assessment of the effects of tinted lenses static visual acuity, contrast sensitivity, colour vision and stereopsis. 10 students (Group B) were then randomly selected from the RAU student population for the assessment of the effects of tinted experimental lenses on visual evoked potential (VEP). The ametropic subjects in Groups A and B all wore their habitual spectacle or contact lens corrections throughout the testing procedure. The following lens tint colours were used: clear, black, grey, yellow, green, blue, red and pink. The subjects were evaluated binocularly without any tinted lens being worn, then through each of the 8 tinted experimental lenses (randomly presented). Results of the visual skills and VEP testing were analysed as follows: Group A: An average score was calculated for the results achieved on the static visual acuity, contrast sensitivity, colour vision and stereopsis tests when no experimental lenses were worn. This average was then compared to the average static visual acuity, contrast sensitivity, colour vision and stereopsis scores for each of the 8 experimental lenses. Group B: An average score was calculated for each of the amplitude and latency components of the VEP waveforms generated when no experimental lenses are worn. This average was then compared to the average amplitude and latency components generated when each of the 8 experimental lenses (as for Group A) are worn. Static visual acuity was assessed using a Snellen visual acuity letter chart at 6m. Contrast sensitivity was assessed using a Vistech VCTS 6500 Contrast Sensitivity Chart at 3m. Colour vision assessment was performed using the lshihara Colour Vision Test and the City University Colour Vision Test. The Random Dot Near Stereo Test was used to assess…

Subjects/Keywords: Eye – Protection; Ophthalmic lenses; Visual acuity

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APA (6^th Edition):

Moore, L. A. (2012). The subjective and objective effects of tinted spectacle lenses on visual performance. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/6056

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Moore, Linda A. “The subjective and objective effects of tinted spectacle lenses on visual performance.” 2012. Thesis, University of Johannesburg. Accessed January 18, 2021. http://hdl.handle.net/10210/6056.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Moore, Linda A. “The subjective and objective effects of tinted spectacle lenses on visual performance.” 2012. Web. 18 Jan 2021.

Vancouver:

Moore LA. The subjective and objective effects of tinted spectacle lenses on visual performance. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10210/6056.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Moore LA. The subjective and objective effects of tinted spectacle lenses on visual performance. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/6056

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

7. Sukha, Anusha Yasvantra. Inter-and intra-subject variation of contrast visual acuities.

Degree: 2015, University of Johannesburg

URL: http://hdl.handle.net/10210/14030

►

D.Phil. (Optometry)

The measurement of Contrast Visual Acuities (contrast VA) is recognised in various studies as an important psychophysical measure of visual function, and contrast… (more)

▼

D.Phil. (Optometry)

The measurement of Contrast Visual Acuities (contrast VA) is recognised in various studies as an important psychophysical measure of visual function, and contrast VA is often used to understand visual limitations or functional disability. Contrast VA is also useful for monitoring the effects of disease modifying therapies. High and medium contrast levels are generally used in studies to evaluate contact lens performance, the outcomes of surgical procedures and for assessing activities of daily living. Measurement of stimuli with low contrast levels are also sometimes applied in diagnosing, monitoring and evaluating disease processes and their management, especially where high contrast visual acuity remains intact. This is believed to be the first study that comprehensively investigates the reliability (or repeatability) of four contrast levels using the computerized Thomson Test Chart 2000 XPert. (A similar study with four contrast levels and both univariate and multivariate analysis as applied in this thesis has not been performed elsewhere). Although the main emphasis of this study was to explore various issues relating to short-term repeatability of contrast VA, both within and across individuals, both univariate and multivariate statistical analyses were also used in this thesis to investigate age and gender related changes in measurements of contrast VA. Together the results from this thesis provide test and re-test contrast VA reliability measures and some basic or preliminary statistical normative contrast VA values, which should aid clinicians to confidently detect abnormal measurements which, in turn, promotes good clinical practice. For this thesis and within a clinical environment to investigate inter-subject variation in contrast VA, two measurements of contrast VA at four specified contrast levels (100%, 10%, 5% and 2.5%) at a 6 metre distance were obtained for the right eyes only of 155 healthy participants. Thus, at each contrast level 155 test and re-test contrast VA measurements were determined using the computerized Thomson Test Chart 2000 XPert. All measurements were determined through the optimal refractive compensation for each right eye of the 155 participants concerned. In a subset of ten subjects or participants, samples of thirty consecutive measurements of contrast VA at each of the four contrast levels were also obtained to explore short-term intra-subject variation in contrast VA. A simple questionnaire was administered to all subjects to obtain biographical, general and ocular health histories. Visual assessment included II subjective clinical refraction, stereopsis, colour vision, direct ophthalmoscopy and biomicroscopy to understand the eyes of the participants and exclude possible factors that could cause ocular or neurological changes in the retina or in vision thereby influencing contrast VA in a detrimental fashion...

Subjects/Keywords: Visual acuity

…sensitivity and contrast visual acuity tests 26 3.3.1 Sine-wave or periodic contrast sensitivity… …tests 26 3.3.2 Letter contrast sensitivity 27 3.3.3 Contrast visual acuity 29 Graphical… …sensitivity and contrast visual acuity 4.1 Correlation coefficients and the coefficient of… …determination 40 4.2 Reliability estimates for contrast sensitivity and contrast visual acuity 45… …4.3 Gender associations of contrast sensitivity and/or contrast visual acuity 51 XII…

2 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sukha, A. Y. (2015). Inter-and intra-subject variation of contrast visual acuities. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/14030

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sukha, Anusha Yasvantra. “Inter-and intra-subject variation of contrast visual acuities.” 2015. Thesis, University of Johannesburg. Accessed January 18, 2021. http://hdl.handle.net/10210/14030.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sukha, Anusha Yasvantra. “Inter-and intra-subject variation of contrast visual acuities.” 2015. Web. 18 Jan 2021.

Vancouver:

Sukha AY. Inter-and intra-subject variation of contrast visual acuities. [Internet] [Thesis]. University of Johannesburg; 2015. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10210/14030.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sukha AY. Inter-and intra-subject variation of contrast visual acuities. [Thesis]. University of Johannesburg; 2015. Available from: http://hdl.handle.net/10210/14030

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. Loudon, Sjoukje. Improvement of therapy for amblyopia.

Degree: 2007, Erasmus University Medical Center

URL: http://hdl.handle.net/1765/39531

► textabstractThe term ‘amblyopia’ originates from the Greek language and literally means dimness or dullness of vision. In time, the condition has been defined in a… (more)

Subjects/Keywords: amblyopia; visual acuity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Loudon, S. (2007). Improvement of therapy for amblyopia. (Doctoral Dissertation). Erasmus University Medical Center. Retrieved from http://hdl.handle.net/1765/39531

Chicago Manual of Style (16^th Edition):

Loudon, Sjoukje. “Improvement of therapy for amblyopia.” 2007. Doctoral Dissertation, Erasmus University Medical Center. Accessed January 18, 2021. http://hdl.handle.net/1765/39531.

MLA Handbook (7^th Edition):

Loudon, Sjoukje. “Improvement of therapy for amblyopia.” 2007. Web. 18 Jan 2021.

Vancouver:

Loudon S. Improvement of therapy for amblyopia. [Internet] [Doctoral dissertation]. Erasmus University Medical Center; 2007. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1765/39531.

Council of Science Editors:

Loudon S. Improvement of therapy for amblyopia. [Doctoral Dissertation]. Erasmus University Medical Center; 2007. Available from: http://hdl.handle.net/1765/39531

Georgia Tech

9. Cunningham, James Burr. Visual acuity as a function of the frequency and amplitude of target vibration.

Degree: MS, Psychology, 1981, Georgia Tech

URL: http://hdl.handle.net/1853/28833

Subjects/Keywords: Visual acuity; Vibration

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APA (6^th Edition):

Cunningham, J. B. (1981). Visual acuity as a function of the frequency and amplitude of target vibration. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/28833

Chicago Manual of Style (16^th Edition):

Cunningham, James Burr. “Visual acuity as a function of the frequency and amplitude of target vibration.” 1981. Masters Thesis, Georgia Tech. Accessed January 18, 2021. http://hdl.handle.net/1853/28833.

MLA Handbook (7^th Edition):

Cunningham, James Burr. “Visual acuity as a function of the frequency and amplitude of target vibration.” 1981. Web. 18 Jan 2021.

Vancouver:

Cunningham JB. Visual acuity as a function of the frequency and amplitude of target vibration. [Internet] [Masters thesis]. Georgia Tech; 1981. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1853/28833.

Council of Science Editors:

Cunningham JB. Visual acuity as a function of the frequency and amplitude of target vibration. [Masters Thesis]. Georgia Tech; 1981. Available from: http://hdl.handle.net/1853/28833

University of Waterloo

10. Faylienejad, Azadeh. A Computational Model for Predicting Visual Acuity from Wavefront Aberration Measurements.

Degree: 2009, University of Waterloo

URL: http://hdl.handle.net/10012/4704

► The main purpose of this thesis is to create and validate a visual acuity model with experimentally obtained aberrations of human eyes. The other motivation… (more)

Subjects/Keywords: aberration; visual acuity

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APA (6^th Edition):

Faylienejad, A. (2009). A Computational Model for Predicting Visual Acuity from Wavefront Aberration Measurements. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/4704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Faylienejad, Azadeh. “A Computational Model for Predicting Visual Acuity from Wavefront Aberration Measurements.” 2009. Thesis, University of Waterloo. Accessed January 18, 2021. http://hdl.handle.net/10012/4704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Faylienejad, Azadeh. “A Computational Model for Predicting Visual Acuity from Wavefront Aberration Measurements.” 2009. Web. 18 Jan 2021.

Vancouver:

Faylienejad A. A Computational Model for Predicting Visual Acuity from Wavefront Aberration Measurements. [Internet] [Thesis]. University of Waterloo; 2009. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10012/4704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Faylienejad A. A Computational Model for Predicting Visual Acuity from Wavefront Aberration Measurements. [Thesis]. University of Waterloo; 2009. Available from: http://hdl.handle.net/10012/4704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

11. Caves, Eleanor Mary. The Visual Ecology of the Cleaner Shrimp-Client Fish Mutualism .

Degree: 2018, Duke University

URL: http://hdl.handle.net/10161/16877

► Cleaner shrimp are small, brightly-colored tropical crustaceans that attract reef fish clients to set locations on a reef called cleaning stations and then "clean"… (more)

▼ Cleaner shrimp are small, brightly-colored tropical crustaceans that attract reef fish clients to set locations on a reef called cleaning stations and then "clean" them by removing ectoparasites from their scales, gills, and mouths. Because clients benefit from the removal of potentially harmful parasites, and shrimp benefit from a meal, this interaction is considered mutualistic. The evolution of cleaner-client relationships is especially paradoxical, however, given that crustaceans make an easy meal for many reef fish. How did such an interaction arise and evolve? Additionally, how do cleaner shrimp and clients find and recognize each other, and why doesn't the client eat the cleaner? One hypothesis is that mutualistic partners evolve signals that identify them as beneficial partners. For the cleaner shrimp-client fish mutualism, it has been suggested that these signals are visual, and function to identify cleaners as helpers, rather than food, and perhaps to identify clients as seeking cleaning rather than a meal. The broad goal of this dissertation was to examine the cleaner shrimp-client fish mutualism by combining visual physiology, visual ecology, and animal behavior. Throughout, I focus on visual acuity-the ability to perceive detail-an underexplored aspect of visual capability which should represent an important selective force on signals, as it determines what visual information can and cannot be resolved. To begin, in Chapter 2, I characterized the visual capabilities of cleaner shrimp for the first time, in particular examining spectral sensitivity, visual acuity, and temporal resolution of three species from the three primary genera where cleaning has arisen. This revealed that these cleaner shrimp have monochromatic, coarse vision, and thus that their color patterns likely do not serve an intraspecific signaling purpose, but rather may be part of signals directed at client fish. Thus, Chapter 3 examined visual acuity in fish by performing a literature synthesis of known visual acuity values across fishes and examining how acuity relates to certain aspects of morphology and ecology. Here, I found that acuity is higher in fish with larger eyes and in fish that live in spatially complex habitats. Having examined the visual capabilities of both parties in the cleaner-client mutualism, I then explored signaling between cleaners and clients. In chapter (4), I used sequential analysis to demonstrate that certain stereotyped motions by cleaner shrimp are signals directed at clients, and provide the first evidence of potential signals on the part of client fish as well. Additionally, I developed an R package, AcuityView (Appendix A) which displays images with only the spatial information available to a receiver of given acuity from a given distance, and used it to show that cleaner and client signals are visible to their intended receivers. Lastly, in Chapter (5), I outlined what we know about acuity across species, provide primers on the anatomical basis for acuity and what factors can make… Advisors/Committee Members: Johnsen, Sönke (advisor).

Subjects/Keywords: Biology; Mutualism; Signaling; Spectral sensitivity; Visual acuity; Visual ecology; Visual physiology

10 more images…

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APA (6^th Edition):

Caves, E. M. (2018). The Visual Ecology of the Cleaner Shrimp-Client Fish Mutualism . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/16877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Caves, Eleanor Mary. “The Visual Ecology of the Cleaner Shrimp-Client Fish Mutualism .” 2018. Thesis, Duke University. Accessed January 18, 2021. http://hdl.handle.net/10161/16877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Caves, Eleanor Mary. “The Visual Ecology of the Cleaner Shrimp-Client Fish Mutualism .” 2018. Web. 18 Jan 2021.

Vancouver:

Caves EM. The Visual Ecology of the Cleaner Shrimp-Client Fish Mutualism . [Internet] [Thesis]. Duke University; 2018. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10161/16877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Caves EM. The Visual Ecology of the Cleaner Shrimp-Client Fish Mutualism . [Thesis]. Duke University; 2018. Available from: http://hdl.handle.net/10161/16877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

12. Camargo, Marina von Zuben de Arruda. Propriedades espaço-temporais da acuidade vernier no córtex visual humano usando potenciais visuais provocados de varredura.

Degree: Mestrado, Neurociências e Comportamento, 2012, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/47/47135/tde-12062012-160008/ ;

►

Esta pesquisa pretendia estabelecer um mapa espaço temporal das respostas de vernier no córtex visual humano. O uso do potencial visual provocado de varredura (PVPv)… (more)

▼

Esta pesquisa pretendia estabelecer um mapa espaço temporal das respostas de vernier no córtex visual humano. O uso do potencial visual provocado de varredura (PVPv) proporciona medidas eficientes e sensíveis dos limiares de vernier com os quais se pode começar a examinar as respostas corticais de vernier no âmbito dos parâmetros espaço temporais. As respostas de vernier foram avaliadas em relação à hipótese de que os sinais retinianos provenientes das células ganglionares da via magnocelular e não da via parvocelular compõem o input neural para córtex que é utilizado para gerar as respostas de vernier (tarefas de localização de alta precisão Lee et a., 1990; Lee et al., 1995). Métodos: As respostas de vernier no córtex humano foram medidas por meio do potencial visual provocado de varredura (PVPv). Quebras de vernier foram introduzidas em grades de ondas quadradas de produzindo colunas verticais intercaladas de barras estáticas e móveis. Medidas binoculares da acuidade vernier foram feitas em grades de alto contraste (64%) em função de 3 frequências temporais (3, 6 e 15 Hz) e 2 frequências espaciais (1 e 8 c/g). Medidas utilizando grades de baixo contraste foram feitas em função de 3 frequências temporais (3, 6 e 10Hz) e 3 frequências espaciais (1, 2 e 8c/g) em ambos os protocolos (alto e baixo contraste) as medidas foram feitas utilizando o PVPv. Foi utilizado o sistema POWER DIVA que utiliza a metodologia dos mínimos quadrados recursivos para extrair a amplitude e fase da resposta nos harmônicos selecionados da frequência do estímulo. Foram analisados o primeiro (1F1) e o segundo (2F1) harmônicos neste estudo. Com base em estudos anteriores, assume-se que o primeiro componente harmônico refere-se às respostas ao estímulo de vernier, e o segundo às respostas ao movimento relativo dos elementos do estímulo. Esta hipótese foi testada por meio da utilização de protocolos controle para ambos os arranjos de estímulos (alto e baixo contraste) em que foram utilizados os mesmos parâmetros, porém com deslocamentos entre as barras completamente simétricos (elementos da grade jamais se alinhavam). O sistema POWER DIVA calcula para cada segundo de janela de análise (bin) a amplitude local. A amplitude média do ruído nos 10 bins de análise é utilizada para calcular a razão sinal ruído para cada bin. Apenas sinais com razão sinal ruído maior que 3 foram considerados resposta. A média vetorial de 8 tentativas para cada condição de estímulo foi utilizada para determinar os limiares.Resultados: Os dados são consistentes com dados psicofísicos anteriores, especialmente os dados de Bradley & Skottun (1987) que demonstraram decréscimo significativo nos limiares de vernier com o aumento da frequência espacial. Os limiares eletrofisiológicos de vernier obtidos com o presente trabalho mostraram-se paralelos aos dados psicofísicos em função das frequências espaciais em ambos os protocolos. Os limiares no 1F1 também demonstraram redução significativa com o aumento da frequência temporal em altas frequências espaciais

The research was…

Advisors/Committee Members: Hamer, Russell David.

Subjects/Keywords: Acuidade visual; Córtex visual; Potenciais visuais provocados; Visual acuity; Visual cortex; Visual evoked potentials

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Camargo, M. v. Z. d. A. (2012). Propriedades espaço-temporais da acuidade vernier no córtex visual humano usando potenciais visuais provocados de varredura. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/47/47135/tde-12062012-160008/ ;

Chicago Manual of Style (16^th Edition):

Camargo, Marina von Zuben de Arruda. “Propriedades espaço-temporais da acuidade vernier no córtex visual humano usando potenciais visuais provocados de varredura.” 2012. Masters Thesis, University of São Paulo. Accessed January 18, 2021. http://www.teses.usp.br/teses/disponiveis/47/47135/tde-12062012-160008/ ;.

MLA Handbook (7^th Edition):

Camargo, Marina von Zuben de Arruda. “Propriedades espaço-temporais da acuidade vernier no córtex visual humano usando potenciais visuais provocados de varredura.” 2012. Web. 18 Jan 2021.

Vancouver:

Camargo MvZdA. Propriedades espaço-temporais da acuidade vernier no córtex visual humano usando potenciais visuais provocados de varredura. [Internet] [Masters thesis]. University of São Paulo; 2012. [cited 2021 Jan 18]. Available from: http://www.teses.usp.br/teses/disponiveis/47/47135/tde-12062012-160008/ ;.

Council of Science Editors:

Camargo MvZdA. Propriedades espaço-temporais da acuidade vernier no córtex visual humano usando potenciais visuais provocados de varredura. [Masters Thesis]. University of São Paulo; 2012. Available from: http://www.teses.usp.br/teses/disponiveis/47/47135/tde-12062012-160008/ ;

13. Weiderpass, Heinar Augusto. Tratamento e análise de sinais neurológicos visuais com wavelets.

Degree: PhD, Patologia, 2008, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/5/5144/tde-18122008-103054/ ;

►

O potencial visual evocado (PVE) é um sinal elétrico de baixa intensidade originado no córtex visual em resposta a uma estimulação visual periódica. O potencial… (more)

▼

O potencial visual evocado (PVE) é um sinal elétrico de baixa intensidade originado no córtex visual em resposta a uma estimulação visual periódica. O potencial visual evocado de varredura é um procedimento de PVE modificado para medir acuidade visual de grades em pacientes pré-verbais e não-verbais. Este biopotencial está imerso em uma grande quantidade de ruído eletroencefalográfico e artefato relacionado ao movimento. A relação sinal-ruído tem um papel dominante na determinação de erros sistemáticos e estatísticos. O propósito deste estudo é apresentar um método baseado na transformada wavelet para filtrar e extrair o potencial evocado visual de varredura. Grades de luminância de onda senoidal moduladas em 6 Hertz foram usadas como estímulo para se determinar os limiares de acuidade. A amplitude e a fase da 2ª. harmônica (12 Hertz) do padrão de resposta foram analisadas usando-se a transformada rápida de Fourier após a filtragem por wavelet. O método da transformada wavelet discreta foi usado para decompor o PVE em coeficientes wavelet, determinando-se quais destes representavam uma atividade significativa. Em um passo seguinte somente os coeficientes relevantes foram considerados, zerando-se os demais e reconstruindo-se, assim, o sinal PVE. Isto resultou na filtragem das demais freqüências que foram consideradas ruído. Simulações numéricas e análises com dados de PVE humanos mostraram que este método forneceu maior relação sinal-ruído quando comparado com o método clássico dos mínimos quadrados recursivo (RLS) e ainda uma análise de fase mais apropriada

Visually evoked potential (VEP) is a very small electrical signal originated in the visual cortex in response to periodic visual stimulation. Sweep-VEP is a modified VEP procedure used to measure grating visual acuity in non-verbal and preverbal patients. This biopotential is buried in a large amount of electroencephalographic noise and movement related artifact. The signal-to-noise ratio (SNR) plays a dominant role in determining both systematic and statistic errors. The purpose of this study is to present a method based on wavelet transform technique for filtering and extracting steady-state sweep-VEP. Counter-phase sine-wave luminance gratings modulated at 6 Hertz were used as stimuli to determine sweep-VEP grating acuity thresholds. The amplitude and phase of the second-harmonic (12 Hertz) pattern reversal response were analyzed using the fast Fourier transform after the wavelet filtering. The wavelet transform method was used to decompose the VEP signal into wavelet coefficients by a discrete wavelet analysis to determine which coefficients yield significant activity at the corresponding frequency. In a subsequent step only significant coefficients were considered and the remaining was set to zero allowing a reconstruction of the VEP signal. This procedure resulted in filtering out other frequencies that were considered noise. Numerical simulations and analyses of human VEP data showed that this method has provided higher SNR when compared with the…

Advisors/Committee Members: Burattini, Marcelo Nascimento.

Subjects/Keywords: Acuidade visual; Córtex visual; Event-related potentials P300; P300; Potencial evocado; Visual acuity; Visual cortex

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Weiderpass, H. A. (2008). Tratamento e análise de sinais neurológicos visuais com wavelets. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/5/5144/tde-18122008-103054/ ;

Chicago Manual of Style (16^th Edition):

Weiderpass, Heinar Augusto. “Tratamento e análise de sinais neurológicos visuais com wavelets.” 2008. Doctoral Dissertation, University of São Paulo. Accessed January 18, 2021. http://www.teses.usp.br/teses/disponiveis/5/5144/tde-18122008-103054/ ;.

MLA Handbook (7^th Edition):

Weiderpass, Heinar Augusto. “Tratamento e análise de sinais neurológicos visuais com wavelets.” 2008. Web. 18 Jan 2021.

Vancouver:

Weiderpass HA. Tratamento e análise de sinais neurológicos visuais com wavelets. [Internet] [Doctoral dissertation]. University of São Paulo; 2008. [cited 2021 Jan 18]. Available from: http://www.teses.usp.br/teses/disponiveis/5/5144/tde-18122008-103054/ ;.

Council of Science Editors:

Weiderpass HA. Tratamento e análise de sinais neurológicos visuais com wavelets. [Doctoral Dissertation]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/5/5144/tde-18122008-103054/ ;

14. Hauzman, Einat. Estudo comparativo da densidade e topografia de neurônios de retinas de Philodryas olfesii e P. patagoniensis (serpentes, colubridae).

Degree: Mestrado, Neurociências e Comportamento, 2009, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/47/47135/tde-10122009-112355/ ;

► As serpentes são um grupo altamente diversificado, encontradas em praticamente todas as regiões do planeta, ocupando diferentes ambientes. Sua diversidade adaptativa indica a grande variabilidade… (more)

▼ As serpentes são um grupo altamente diversificado, encontradas em praticamente todas as regiões do planeta, ocupando diferentes ambientes. Sua diversidade adaptativa indica a grande variabilidade dos órgãos sensoriais, adaptados ao hábitat e hábitos de cada espécie. Estudos sobre o sistema visual das serpentes são escassos e tem grande importância na compreensão de caracteres ecológicos, comportamentais e filogenéticos. Nos vertebrados as informações visuais são projetadas na retina e inicialmente processadas nessa camada neural, antes do processamento que ocorre no sistema nervoso central. Os tipos de células encontradas na retina, bem como sua densidade e distribuição variam entre as espécies e determinam especializações do sistema visual. Neste trabalho foi feita uma quantificaçao comparativa de fotorreceptores e neurônios da camada de células ganglionares (CCG) de duas espécies de serpentes colubrídeas diurnas, Philodryas olfersii e P. patagoniensis. Para tanto foram utilizadas técnicas de imunohistoquímica de opsinas e de marcação de Nissl. Serpentes adultas obtidas no Instituto Butantan foram anestesiadas com tiopental (30mg/kg) e sacrificadas com CO2. Os olhos foram enucleados e as retinas dissecadas e fixadas em paraformaldeido 4%. Um olho de cada serpente foi utilizado para fazer cortes radiais e testar diferentes tipos e concentrações de anticorpos. Para a preparação das retinas planas foram utilizados o anticorpo JH455, produzido em coelhos contra opsinas sensíveis aos comprimentos de onda curto de humanos (cones S) e o anticorpo JH492, produzido em coelhos contra opsinas sensíveis aos comprimentos de onda médio e longo de humanos (cones L/M). Foi utilizado anticorpo secundário biotinilado (gt -rb biot) e a revelação feita com estreptavidina acoplada a molécula florescente CY3. Os cortes radiais e as retinas planas foram observadas em microscópio fluorescente equipado com câmara digital conectada a microcomputador dotado de programa para captura de imagens. A partir de imagens da retina obtidas com espaçamento mínimo de 0,5 mm foram feitas as contagens das células e os mapas de isodensidade celular. A densidade média dos fotorreceptores foi semelhante nas duas espécies (11.183,1 ± 1.107,4 células/mm2 em P. olfersii e 11.531,2 ± 1.054,9 células/mm2 em P. patagoniensis), assim como a proporção dos diferentes tipos de cones (3% cones S e 83% cones L/M em P. olfersii, e 5% cones S e 85% cones L/M em P. patagoniensis). As densidades de células da CCG também foram semelhantes (10.117,5 ± 1.026 células/mm2 em P. olfersii e 9.834,9 ± 2.772,2 células/mm2 em P. patagoniensis). Entretanto, os mapas de isodensidade mostraram diferentes regiões de especialização. P. olfersii apresentou uma faixa horizontal e duas areas centralis de maior densidade celular, uma na região central e uma na região caudal, indicando a melhor acuidade visual nos campos de visão frontal e lateral, o que possivelmente auxilia na locomoção e forrageamento no extrato arbóreo. P. patagoniensis apresentou maior densidade celular na região ventral… Advisors/Committee Members: Ventura, Dora Selma Fix.

Subjects/Keywords: Acuidade visual; Eye (anatomy); Neurônios; Neurons; Retina; Serpentes; Snakes; Visual acuity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hauzman, E. (2009). Estudo comparativo da densidade e topografia de neurônios de retinas de Philodryas olfesii e P. patagoniensis (serpentes, colubridae). (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/47/47135/tde-10122009-112355/ ;

Chicago Manual of Style (16^th Edition):

Hauzman, Einat. “Estudo comparativo da densidade e topografia de neurônios de retinas de Philodryas olfesii e P. patagoniensis (serpentes, colubridae).” 2009. Masters Thesis, University of São Paulo. Accessed January 18, 2021. http://www.teses.usp.br/teses/disponiveis/47/47135/tde-10122009-112355/ ;.

MLA Handbook (7^th Edition):

Hauzman, Einat. “Estudo comparativo da densidade e topografia de neurônios de retinas de Philodryas olfesii e P. patagoniensis (serpentes, colubridae).” 2009. Web. 18 Jan 2021.

Vancouver:

Hauzman E. Estudo comparativo da densidade e topografia de neurônios de retinas de Philodryas olfesii e P. patagoniensis (serpentes, colubridae). [Internet] [Masters thesis]. University of São Paulo; 2009. [cited 2021 Jan 18]. Available from: http://www.teses.usp.br/teses/disponiveis/47/47135/tde-10122009-112355/ ;.

Council of Science Editors:

Hauzman E. Estudo comparativo da densidade e topografia de neurônios de retinas de Philodryas olfesii e P. patagoniensis (serpentes, colubridae). [Masters Thesis]. University of São Paulo; 2009. Available from: http://www.teses.usp.br/teses/disponiveis/47/47135/tde-10122009-112355/ ;

15. Sales, Renata. Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular.

Degree: PhD, Mecanismos Fisiopatológicos nos Sistemas Visual e Audio-Vestibular, 2013, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/17/17150/tde-22102013-144514/ ;

►

SALES, R. Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular. 106f. Tese (Doutorado) da Faculdade de Medicina de Ribeirão Preto-USP. Ribeirão… (more)

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SALES, R. Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular. 106f. Tese (Doutorado) da Faculdade de Medicina de Ribeirão Preto-USP. Ribeirão Preto-SP, 2013. Para a obtenção da visão nítida é necessário que a imagem permaneça estável na retina, mesmo com a movimentação cefálica. As pessoas que sofrem de labirintopatias são mais sensíveis a efeitos visuais, podendo apresentar os sintomas de tontura, enjoo e oscilopsia durante a movimentação cefálica. Esse fato ocorre devido ao conflito sensorial entre o sistema vestibular e visual. O presente estudo objetivou verificar a variação da acuidade visual estática e dinâmica em pacientes com disfunção vestibular. Foram selecionados pacientes de ambos os sexos, com idade entre 14 e 88 anos de idade submetidos ao exame de vetoeletronistagmografia entre os anos de 2009 e 2011. Esses pacientes também foram submetidos ao exame de acuidade visual estática e dinâmica. Na acuidade visual dinâmica, foram pré-determinadas frequências de 0.5, 1.0, 1.5 e 2.0 Hertz para a movimentação cefálica. Os resultados mostraram maior decréscimo da acuidade visual estática e dinâmica entre os pacientes com labirintopatias bilaterais se comparadas com as unilaterais e o grupo controle. Além disso, o aumento da frequência produziu decréscimo da acuidade visual em todos os grupos e a posição da movimentação cefálica na vertical mostrou maior sensibilidade se comparada à horizontal. Pôde-se concluir que os pacientes com labirintopatias apresentaram decréscimo da acuidade visual estática e dinâmica, principalmente nas frequências mais altas e com a movimentação cefálica na posição vertical, sendo esses exames importantes para auxiliar no diagnóstico e monitoramento das labirintopatias. Palavras-chave: Acuidade visual; Sistema vestibular

For obtaining an accurate image is necessary that remains stable on the retina, even with head movement. People suffering from labyrinthopathy are more sensitive to visual effects, and may have symptoms of dizziness, nausea and oscillopsia during head movement. This fact occurs because the sensory conflict between visual and vestibular system. The present study aimed to determine the variation of static and dynamic visual acuity in patients with vestibular dysfunction. Selected patients were of both gender, aged between 14 and 88 years old who underwent examination vetoeletronistagmografia between the years 2009 and 2011 at the home Institution. The patients were subjected to tests of visual acuity static and dynamic. In dynamic visual acuity, were predetermined frequencies of 0.5, 1.0, 1.5 and 2.0 Hz for the patient\'s head movement. The results showed a greater decrease in static and dynamic visual acuity among patients with bilateral labyrinthopathy compared with the unilateral and control groups. In addition, the frequency increase produced decreased visual acuity in all groups and the position of head movement in the vertical showed a higher sensitivity compared to the horizontal. It was concluded that patients with…

Advisors/Committee Members: Colafêmina, José Fernando.

Subjects/Keywords: Acuidade visual; Sistema vestibular; Vestibular system; Visual acuity

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APA (6^th Edition):

Sales, R. (2013). Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/17/17150/tde-22102013-144514/ ;

Chicago Manual of Style (16^th Edition):

Sales, Renata. “Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular.” 2013. Doctoral Dissertation, University of São Paulo. Accessed January 18, 2021. http://www.teses.usp.br/teses/disponiveis/17/17150/tde-22102013-144514/ ;.

MLA Handbook (7^th Edition):

Sales, Renata. “Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular.” 2013. Web. 18 Jan 2021.

Vancouver:

Sales R. Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular. [Internet] [Doctoral dissertation]. University of São Paulo; 2013. [cited 2021 Jan 18]. Available from: http://www.teses.usp.br/teses/disponiveis/17/17150/tde-22102013-144514/ ;.

Council of Science Editors:

Sales R. Achados da acuidade visual estática e dinâmica em pacientes com disfunção vestibular. [Doctoral Dissertation]. University of São Paulo; 2013. Available from: http://www.teses.usp.br/teses/disponiveis/17/17150/tde-22102013-144514/ ;

Universidade Estadual de Campinas

16. Bisneto, Otavio Siqueira, 1974-. Lente intraocular suplementar Sulcoflex® Multifocal : análise dos resultados e complicações: Sulcoflex® Multifocal intraocular lens : analysis of clinical results and complications.

Degree: 2013, Universidade Estadual de Campinas

URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/308534

► Abstract: Purpose: to evaluate the clinical results and possible complications of the Sulcoflex® Multifocal intraocular lens implantation. Methods: It was conducted a case series study… (more)

▼ Abstract: Purpose: to evaluate the clinical results and possible complications of the Sulcoflex® Multifocal intraocular lens implantation. Methods: It was conducted a case series study of patients undergoing IOL Sulcoflex® Multifocal bilateral implantation at Paraná Eye Hospital (Curitiba - Brazil). It were included patients previously operated for cataract, underwent bilateral implantation of IOL Sulcoflex® Multifocal, from July 2010 to January 2012, being the main inclusion criteria, presence of monofocal no accommodative IOL implanted in capsular bag in both eyes and best corrected or not visual acuity 20/25 or better in both eyes; the main exclusion criterias were presence of eye disease, cylindrical refraction greater than -0.75 diopters or greater than 3 positive or negative spherical diopters. It were studied the following variables: visual acuity for near and distance vision with and without optical correction; degree of sphero-cylindrical refraction, intraocular pressure, endothelial cell count, high-order aberrations, contrast sensitivity and intra and postoperative complications. All surgeries were performed by the same surgeon, under topical anesthesia with IOL implant incision by 2.75 mm, with the target of emmetropia. Results: It was evaluated 16 eyes of 8 persons. The mean age was 63,87 +- 7,1 years, ranging from 55 to 79 years. The mean follow up was 11,37 +- 1,4 months, ranging from 10 to 14 months. It was observed decreased of 1 line in distance visual acuity without correction in 7 eyes (43,7%), and improvement of near visual acuity, with all eyes J2 or better without correction. Conclusion: after Sulcoflex® Multifocal IOL implantation, the near vision without correction was improved, the far vision with and without correction was decreased, and contrast sensitivity was decreased in 2 of 5 spatial frequencies studieds. The reverse opening (anterior facing back) of one IOL at the time of implantation caused a significant loss of endothelial cells in this eye Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Arieta, Carlos Eduardo Leite, 1956- (advisor), Universidade Estadual de Campinas. Faculdade de Ciências Médicas (institution), Programa de Pós-Graduação em Ciências Médicas (nameofprogram), Alves, Milton Ruiz (committee member), Coelho, Roberto Pinto (committee member), Castro, Rosane Silvestre de (committee member), Nascimento, Mauricio Abujamra (committee member).

Subjects/Keywords: Lentes intraoculares; Acuidade visual; Lenses, Intraocular; Visual acuity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bisneto, Otavio Siqueira, 1. (2013). Lente intraocular suplementar Sulcoflex® Multifocal : análise dos resultados e complicações: Sulcoflex® Multifocal intraocular lens : analysis of clinical results and complications. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/308534

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bisneto, Otavio Siqueira, 1974-. “Lente intraocular suplementar Sulcoflex® Multifocal : análise dos resultados e complicações: Sulcoflex® Multifocal intraocular lens : analysis of clinical results and complications.” 2013. Thesis, Universidade Estadual de Campinas. Accessed January 18, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/308534.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bisneto, Otavio Siqueira, 1974-. “Lente intraocular suplementar Sulcoflex® Multifocal : análise dos resultados e complicações: Sulcoflex® Multifocal intraocular lens : analysis of clinical results and complications.” 2013. Web. 18 Jan 2021.

Vancouver:

Bisneto, Otavio Siqueira 1. Lente intraocular suplementar Sulcoflex® Multifocal : análise dos resultados e complicações: Sulcoflex® Multifocal intraocular lens : analysis of clinical results and complications. [Internet] [Thesis]. Universidade Estadual de Campinas; 2013. [cited 2021 Jan 18]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/308534.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bisneto, Otavio Siqueira 1. Lente intraocular suplementar Sulcoflex® Multifocal : análise dos resultados e complicações: Sulcoflex® Multifocal intraocular lens : analysis of clinical results and complications. [Thesis]. Universidade Estadual de Campinas; 2013. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/308534

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Addis Ababa University

17. Haile, Fentahun. THE PREVALENCE OF VISUAL ACUITY IMPAIRMENT AND COLOR BLINDNESS ON SCHOOL AGE CHILDREN OF TWO PRIMARY SCHOOLS IN ADDIS ABABA.

Degree: 2014, Addis Ababa University

URL: http://etd.aau.edu.et/dspace/handle/123456789/5407

► ABSTRACT Vision is the primary means of integration between individuals and the external environments. For a normal eye, light is focused on the retina. This… (more)

▼ ABSTRACT Vision is the primary means of integration between individuals and the external environments. For a normal eye, light is focused on the retina. This message would then be sent to the brain to be interpreted as a message. There are different factors that will affect normal vision such as infection, malnutrition, lack of vitamin A rich food, refractive error, cataract, etc. Visual impairment is major cause of blindness and mortality in developing countries where there is no enough health care services and because of malnutrition. The main aim of this study was to determine the prevalence of visual acuity impairment and color blindness in school children. The study was conducted in randomly selected one governmental and one private primary schools in Addis Ababa from Sep.10 to Nov.30, 2013. A cross sectional study design was utilized and using random sampling with estimated sample size calculation, 378 students in two schools were involved in the study. All the school age children in the selected schools who have a written consent from their parents were included. Snellen chart was used for visual acuity test and color blindness was determined using Ishihara’s tests. Students who have visual acuity ≤ 6/12 and color blindness were further interviewed and diagnosed by ophthalmologist to identify the causes of visual acuity impairment. Structural questionnaires were also prepared and filled by parents to know the socio demographic features. The collected data was manually cleared and checked and the result was presented in the form of table and graph using SPSS version 20. Although prevalence of blindness is high as people aged, it is also a major problem in children in developing countries like Ethiopia because of malnutrition and limitation of health service. The study found the prevalence of visual acuity impairment; VA ≤ 6/12 in either eye was 5.8% (3.2% female, 2.6% male); VA< 6/18 in either eye was 1.1% and VA < 6/18 in better eye was 0.53%. The prevalence of color blindness in this study was 4.2% (1.6% female, 2.6% male); 2.9% deutran, 1.1% protan and 0.3% color weakness. Although the prevalence of visual impairment in children was very low, priority should be given to them because the health of children would have high cost for economic, social and educational development of the community. Most visually impaired children showed low compliance with the use of spectacle. Thus, Ministry of Health, Ministry of Education and other stakeholders should look at different strategies among students to have behavioral change about the use of spectacles. Further studies to be done to determine magnitude and severity of CVD using anomaloscope, visual impairment of near vision using jaeger eye chart and risk factors for visual problems. Early detection of visual defect of an individual is very important in life to make decision on future career or to take correction. Key words: visual acuity, color blindness, prevalence and visual… Advisors/Committee Members: Getahun Shibru(Dr),Abiy Mulugeta(Dr.) (advisor).

Subjects/Keywords: visual acuity; color blindness; prevalence and visual impairment.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Haile, F. (2014). THE PREVALENCE OF VISUAL ACUITY IMPAIRMENT AND COLOR BLINDNESS ON SCHOOL AGE CHILDREN OF TWO PRIMARY SCHOOLS IN ADDIS ABABA. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/5407

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Haile, Fentahun. “THE PREVALENCE OF VISUAL ACUITY IMPAIRMENT AND COLOR BLINDNESS ON SCHOOL AGE CHILDREN OF TWO PRIMARY SCHOOLS IN ADDIS ABABA. ” 2014. Thesis, Addis Ababa University. Accessed January 18, 2021. http://etd.aau.edu.et/dspace/handle/123456789/5407.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Haile, Fentahun. “THE PREVALENCE OF VISUAL ACUITY IMPAIRMENT AND COLOR BLINDNESS ON SCHOOL AGE CHILDREN OF TWO PRIMARY SCHOOLS IN ADDIS ABABA. ” 2014. Web. 18 Jan 2021.

Vancouver:

Haile F. THE PREVALENCE OF VISUAL ACUITY IMPAIRMENT AND COLOR BLINDNESS ON SCHOOL AGE CHILDREN OF TWO PRIMARY SCHOOLS IN ADDIS ABABA. [Internet] [Thesis]. Addis Ababa University; 2014. [cited 2021 Jan 18]. Available from: http://etd.aau.edu.et/dspace/handle/123456789/5407.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Haile F. THE PREVALENCE OF VISUAL ACUITY IMPAIRMENT AND COLOR BLINDNESS ON SCHOOL AGE CHILDREN OF TWO PRIMARY SCHOOLS IN ADDIS ABABA. [Thesis]. Addis Ababa University; 2014. Available from: http://etd.aau.edu.et/dspace/handle/123456789/5407

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

18. Hirano, Mariko. The Validation of a Novel Dynamic Visual Acuity Test, and Examination of the Effects of Different Factors on Dynamic Visual Acuity.

Degree: 2018, University of Waterloo

URL: http://hdl.handle.net/10012/13336

► Purpose: When a target is in motion, two thresholds can be measured: dynamic visual acuity (DVA, the smallest target size at which an observer can… (more)

▼ Purpose: When a target is in motion, two thresholds can be measured: dynamic visual acuity (DVA, the smallest target size at which an observer can resolve target detail) and speed threshold (the fastest target speed at which an observer can resolve target detail). Many different factors can influence DVA and speed threshold, including target trajectory, velocity, size, contrast, and colour. The limitation with research to date is that there is no standardized, validated tool with which to assess either DVA or speed thresholds. The Vision & Motor Performance Lab at the University of Waterloo School of Optometry has recently developed a distance visual acuity chart (moV&, V&MP Vision Suite) that can measure static visual acuity, DVA, and speed thresholds. moV& allows for the specifications of target trajectory, speed, size, contrast, and colour of both the target and background when measuring DVA. The primary objective of this dissertation is to examine the validity and repeatability of the high contrast (100% contrast), low contrast (61% and 20% contrast), and colour (red target on a white background and white target on a blue background) functions of moV&. If reliable, the data will then be used to examine the effect of target trajectory, speed, and size on DVA and speed threshold. Methods: Three cross-sectional studies were conducted in order to address the research objectives. Each experiment required participants to attend 2 study visits separated by a minimum of 14 days. All participants completed the static visual acuity tests before completing the dynamic tests in a randomized order. Experiment 1 (n = 25) determined the validity and repeatability of moV& using targets at 100% contrast. At each visit, static and dynamic visual acuity was measured using Snellen, ETDRS, and moV& charts. Experiment 2 determined the repeatability of the low contrast and coloured functions of moV&. Participants were assigned to either the contrast (n=21) or colour (n=21) study block. For the contrast block, low contrast (61% and 20% contrast) static and dynamic visual acuities were measured using Snellen and moV& charts. For the colour block, coloured optotype and background (red target on a white background, white target on a blue background) static and dynamic visual acuities were measured using the ETDRS and moV& charts. Experiment 3 (n = 67) examined the effect of target trajectory, speed, and size on DVA and speed threshold using the targets studied in Experiments 1-2. Data from Experiments 1 and 2 was used to determine the effect of target trajectory, speed, and size on DVA and speed threshold. A repeated measure ANOVA was used to compare static moV& visual acuity to ETDRS and Snellen charts. Test-retest reliability was determined via Lin’s correlation coefficient of concordance (CCC). Three-way ANOVA was used to determine the effect of trajectory, speed, and size on DVA and speed thresholds. Results: moV& yielded similar high contrast static visual acuity when compared to the EDTRS and Snellen charts. All high contrast…

Subjects/Keywords: dynamic visual acuity; visual acuity; validation; repeatability

…32 3.2.1 Static Visual Acuity… …34 3.2.2 Dynamic Visual Acuity… …44 3.4.1 Static Visual Acuity… …47 3.4.4 Dynamic Visual Acuity… …Visual Acuity Chart…

10 more images…

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APA (6^th Edition):

Hirano, M. (2018). The Validation of a Novel Dynamic Visual Acuity Test, and Examination of the Effects of Different Factors on Dynamic Visual Acuity. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/13336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hirano, Mariko. “The Validation of a Novel Dynamic Visual Acuity Test, and Examination of the Effects of Different Factors on Dynamic Visual Acuity.” 2018. Thesis, University of Waterloo. Accessed January 18, 2021. http://hdl.handle.net/10012/13336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hirano, Mariko. “The Validation of a Novel Dynamic Visual Acuity Test, and Examination of the Effects of Different Factors on Dynamic Visual Acuity.” 2018. Web. 18 Jan 2021.

Vancouver:

Hirano M. The Validation of a Novel Dynamic Visual Acuity Test, and Examination of the Effects of Different Factors on Dynamic Visual Acuity. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10012/13336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hirano M. The Validation of a Novel Dynamic Visual Acuity Test, and Examination of the Effects of Different Factors on Dynamic Visual Acuity. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/13336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Soeters, N. Applications and advantages of corneal crosslinking for treatment of keratoconus.

Degree: 2015, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/311050

► Keratoconus is a corneal disorder in which the cornea becomes cone-shaped due to stromal thinning and corneal weakening. It mainly affects young individuals and although… (more)

▼ Keratoconus is a corneal disorder in which the cornea becomes cone-shaped due to stromal thinning and corneal weakening. It mainly affects young individuals and although the prevalence is low (1:2000), the impact on quality of life is high. Despite much effort, still no cure has been found for keratoconus. Although it does not cure keratoconus, CXL can be considered a revolutionary contribution, since it is the only treatment option for progressive cases. CXL is a relatively low invasive procedure to increase corneal rigidity. The treatment is performed a follows: after epithelial removal, isotonic riboflavin drops are applied to the cornea for 30 minutes and subsequently ultraviolet-A irradiation starts for 30 minutes. Reasons to remove the epithelium are that it acts a barrier for riboflavin molecules to enter the stroma, in addition to the fact that epithelium absorbs UV light. Due to the removal of epithelium, patients sensate (sometimes intensive) pain during the first postoperative hours, which extinguishes in the next day(s). Other known symptoms are blurry vision and photofobia. Complete healing of the corneal epithelium is generally within 5 days, and the risk of early post-operative complications (3-8%) is mostly related to epithelial healing. Transepithelial CXL whereby the epithelium is left intact might avoid epithelial healing problems and would be a less painful procedure. In general, standard (epithelium-off) CXL has been shown to be an effective treatment with a high success rate (92%) of halting keratoconus progression. In our randomized controlled trial, transepithelial CXL performed significantly less than standard epithelium-off CXL. In 23% of eyes that underwent transepithelial CXL, keratoconus progression continued after 1 year. Progression was halted in 100% in the group with standard epithelium-off CXL. Therefore, we do not recommend replacing the standard CXL treatment for transepithelial CXL. We also analyzed the epithelium-off CXL effect in patients at the pediatric age (<18 years). In young patients, keratoconus progression can be rapid and intervention with CXL has been advised as soon as any clinical sign of progression is noted. For the last years, there is a trend to perform CXL in patients < 18 years directly after the diagnosis is made, instead of waiting for signs of progression (as is the case in adults ≥ 18 years). This is important, since visual acuity is often still very good at this point and although risks of post-operative complications are low, a clear communication with parents and more than average patient care is mandatory when treating young patients. In our study, we found an equally safe result in pediatric patients compared to patients from 18-26 and >26 years old. Furthermore, pediatric patients showed more visual improvement compared to the other groups. An uncertainty in pediatric patients is the duration of the CXL effect. The turnover rate of stromal collagen ranges between 2 and 7 years. Since the renewed collagen might not have the same… Advisors/Committee Members: Imhof, S.M., Koning-Tahzib, N.G. de.

Subjects/Keywords: keratoconus; crosslinking; CXL; topography; pachymetry; keratometry; visual acuity; transepithelial; scleral lens

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soeters, N. (2015). Applications and advantages of corneal crosslinking for treatment of keratoconus. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/311050

Chicago Manual of Style (16^th Edition):

Soeters, N. “Applications and advantages of corneal crosslinking for treatment of keratoconus.” 2015. Doctoral Dissertation, Universiteit Utrecht. Accessed January 18, 2021. http://dspace.library.uu.nl:8080/handle/1874/311050.

MLA Handbook (7^th Edition):

Soeters, N. “Applications and advantages of corneal crosslinking for treatment of keratoconus.” 2015. Web. 18 Jan 2021.

Vancouver:

Soeters N. Applications and advantages of corneal crosslinking for treatment of keratoconus. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2015. [cited 2021 Jan 18]. Available from: http://dspace.library.uu.nl:8080/handle/1874/311050.

Council of Science Editors:

Soeters N. Applications and advantages of corneal crosslinking for treatment of keratoconus. [Doctoral Dissertation]. Universiteit Utrecht; 2015. Available from: http://dspace.library.uu.nl:8080/handle/1874/311050

University of Ottawa

20. Znotinas, Katherine. Sensory Capabilities of Polypterus Senegalus in Aquatic and Terrestrial Environments .

Degree: 2018, University of Ottawa

URL: http://hdl.handle.net/10393/37088

► In the amphibious fish Polypterus senegalus, focussing on lateral line, vision and electrosensation, we investigated sensory abilities, their interactions, and changes in their effects on… (more)

Subjects/Keywords: amphibious fishes; sensory deprivation; fish locomotion; lateral line; visual acuity; electrogenesis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Znotinas, K. (2018). Sensory Capabilities of Polypterus Senegalus in Aquatic and Terrestrial Environments . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/37088

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Znotinas, Katherine. “Sensory Capabilities of Polypterus Senegalus in Aquatic and Terrestrial Environments .” 2018. Thesis, University of Ottawa. Accessed January 18, 2021. http://hdl.handle.net/10393/37088.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Znotinas, Katherine. “Sensory Capabilities of Polypterus Senegalus in Aquatic and Terrestrial Environments .” 2018. Web. 18 Jan 2021.

Vancouver:

Znotinas K. Sensory Capabilities of Polypterus Senegalus in Aquatic and Terrestrial Environments . [Internet] [Thesis]. University of Ottawa; 2018. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10393/37088.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Znotinas K. Sensory Capabilities of Polypterus Senegalus in Aquatic and Terrestrial Environments . [Thesis]. University of Ottawa; 2018. Available from: http://hdl.handle.net/10393/37088

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tasmania

21. Hunt, DE. The effect of visual capacity and swimming ability of fish on the performance of light-based bycatch reduction devices in prawn trawls.

Degree: 2016, University of Tasmania

URL: https://eprints.utas.edu.au/23067/1/Hunt_whole_thesis.pdf

► Discarding is the practice of returning unwanted catch to the sea during commercial fishing. However, the discarding process is costly and time consuming and some… (more)

▼ Discarding is the practice of returning unwanted catch to the sea during commercial fishing. However, the discarding process is costly and time consuming and some fish bycatch species have a high post-capture mortality rate. Therefore, reducing bycatch and thus discarding is a major reason for ongoing research and development into Bycatch Reduction Devices (BRDs). This research presents a novel BRD that uses artificial light attached to the headline of commercial prawn trawl nets and insight into its effect on reducing the overall capture of fish bycatch. Two designs of light BRDs were developed and tested in the temperate waters of North-Eastern Tasmania as well as the tropical waters of Moreton Bay, Queensland. It was found that there was a 50% reduction in total fish bycatch in temperate waters but no evidence of a significant difference in total fish catch in tropical waters. There were species-specific differences in the changes of catch rates with the use of the lights. Most species were found to decrease in catch with the use of light, and one species in particular, P. bassensis, was reduced by 75%. The only evidence that the lights had any effect on size distribution was found for two species, T. declivis and P. melbournensis that had significantly different length frequency distributions with the use of artificial light. In an attempt to explain species-specific changes in catch rates, the visual and swimming capabilities of a range of bycatch species were studied. The photoreceptor cell densities and potential visual acuity were quantified using histological techniques on the eyes of eight species of interest: Lepidotrigla mulhalli; Lophonectes gallus; Platycephalus bassensis; Sillago flindersi; Neoplatycephalus richardsoni; Thamnaconus degeni; Parequula melbournensis; and Trachurus declivis. The cone densities ranged from 38 cones per 0.01 mm2 for S. flindersi to 235 cones per 0.01 mm2 for P. melbournensis. The rod densities ranged from 22 800 cells per 0.01 mm2 for L. mulhalli to 76 634 cells per 0.01 mm2 for T. declivis and potential visual acuity (based on anatomical measures) ranged from 0.08 in L. gallus to 0.31 in P. melbournensis. Higher rod densities were correlated with maximum habitat depths. Parequula melbournensis had the greatest potential ability for detecting fine detail based on eye anatomy. The stride length and maximum swimming speeds were estimated for five of these eight species. The maximum swimming speeds of L. mulhalli, P. melbournensis, P. bassensis, T. degeni and T. declivis were 1.71, 4.17, 4.80, 3.19 and 6.40 m s-1, respectively. Trachurus declivis had the longest stride length and fastest maximum swimming speed. Therefore, based on swimming capability it is predicted that of the five species studied, T. declivis would be most likely to avoid capture by a trawl net. The results show a linear relationship between the potential visual acuity and percent change in catch rate, and also between the maximum swimming speed and percent change in catch rate of the species of interest.…

Subjects/Keywords: BRO; artificial light; maximum swim speed; visual acuity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hunt, D. (2016). The effect of visual capacity and swimming ability of fish on the performance of light-based bycatch reduction devices in prawn trawls. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/23067/1/Hunt_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hunt, DE. “The effect of visual capacity and swimming ability of fish on the performance of light-based bycatch reduction devices in prawn trawls.” 2016. Thesis, University of Tasmania. Accessed January 18, 2021. https://eprints.utas.edu.au/23067/1/Hunt_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hunt, DE. “The effect of visual capacity and swimming ability of fish on the performance of light-based bycatch reduction devices in prawn trawls.” 2016. Web. 18 Jan 2021.

Vancouver:

Hunt D. The effect of visual capacity and swimming ability of fish on the performance of light-based bycatch reduction devices in prawn trawls. [Internet] [Thesis]. University of Tasmania; 2016. [cited 2021 Jan 18]. Available from: https://eprints.utas.edu.au/23067/1/Hunt_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hunt D. The effect of visual capacity and swimming ability of fish on the performance of light-based bycatch reduction devices in prawn trawls. [Thesis]. University of Tasmania; 2016. Available from: https://eprints.utas.edu.au/23067/1/Hunt_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

22. Rana, Ranjan. The effects on visual acuity following Nd: Yag laser posterior capsulotomy after ECCE with or without IOL implimentation and evaluate its associated complications (s); -.

Degree: Opthalmology, 2002, Bundelkhand University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/12114

None

Biblography p.103-117

Advisors/Committee Members: Jain, B S, Misurya, V K.

Subjects/Keywords: acuity; capsulotomy; Posterior; visual

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APA (6^th Edition):

Rana, R. (2002). The effects on visual acuity following Nd: Yag laser posterior capsulotomy after ECCE with or without IOL implimentation and evaluate its associated complications (s); -. (Thesis). Bundelkhand University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/12114

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rana, Ranjan. “The effects on visual acuity following Nd: Yag laser posterior capsulotomy after ECCE with or without IOL implimentation and evaluate its associated complications (s); -.” 2002. Thesis, Bundelkhand University. Accessed January 18, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/12114.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rana, Ranjan. “The effects on visual acuity following Nd: Yag laser posterior capsulotomy after ECCE with or without IOL implimentation and evaluate its associated complications (s); -.” 2002. Web. 18 Jan 2021.

Vancouver:

Rana R. The effects on visual acuity following Nd: Yag laser posterior capsulotomy after ECCE with or without IOL implimentation and evaluate its associated complications (s); -. [Internet] [Thesis]. Bundelkhand University; 2002. [cited 2021 Jan 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12114.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rana R. The effects on visual acuity following Nd: Yag laser posterior capsulotomy after ECCE with or without IOL implimentation and evaluate its associated complications (s); -. [Thesis]. Bundelkhand University; 2002. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12114

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

23. Yee, Alan. Investigation of vision strategies used in a dynamic visual acuity task.

Degree: 2017, University of Waterloo

URL: http://hdl.handle.net/10012/12575

► Purpose: Dynamic visual acuity (DVA), the ability to resolve fine details of a moving target, requires spatial resolution and accurate oculomotor control. Individuals who engage… (more)

▼ Purpose: Dynamic visual acuity (DVA), the ability to resolve fine details of a moving target, requires spatial resolution and accurate oculomotor control. Individuals who engage in activities in highly dynamic visual environments are thought to have superior dynamic visual acuity and utilize different gaze behaviours (fixations, smooth pursuits, and saccades). This study was designed to test the hypothesis that athletes and video game players (VGPs) have superior DVA to controls. Furthermore, the study was designed to investigate why DVA may be different between groups. Methods: A pre-registered, cross-sectional study examined static visual acuity (SVA), DVA, smooth pursuit gains, and gaze behaviours (fixations, smooth pursuits, and saccades) in 46 emmetropic participants (15 athletes, 11 VGPs, and 20 controls). Athletes were members of varsity teams (or equivalent) who played dynamic sports (such as hockey, soccer, and baseball) for more than 1 year with a current participation of more than 6 hours per week. VGPs played action video games four times per week for a minimum of one hour per day. Controls did not play sports or video games. SVA (LogMAR) was tested with an Early Treatment Diabetic Retinopathy Study (ETDRS) chart. DVA (LogMAR; mov&, V&mp Vision Suite) was tested with Tumbling E optotypes that moved either horizontally (left to right) or randomly (Brownian motion) at 5°/s, 10°/s, 20°/s, or 30°/s. Task response time was measured by averaging the amount of time it took to respond to each letter per trial (i.e random 30°/s, horizontal 10°/s, etc.) which indicated the time it took for a motor response to occur. Smooth pursuit gains were tested with El-Mar eye tracker while participants completed a step-ramp task with the same respective velocities as the DVA task. A one-way independent measures ANOVA was used to analyze smooth pursuits. Relative duration of gaze behaviours were measured with the Arrington eye tracker while participants performed the DVA task. A one-way independent measures ANOVA was used to test for group differences in SVA. A one-way ANOVA was used to test for group and speed differences in DVA. A repeated-measures two-way ANOVA was used to compare gaze behaviours of the first five and last five letters of 30°/s velocity. Results: SVA was not significantly different between groups (p=0.595). Random motion DVA at 30°/s was significantly different between groups (p=0.039), specifically between athletes and controls (p=0.030). Thus, athletes were better than controls at random 30°/s. Horizontal motion DVA at 30°/s was also significantly between groups (p=0.031). Post-hoc analysis revealed a significant difference between athletes and VGPs (p=0.046). This suggests that athletes were better than VGPs at horizontal 30°/s. DVA task response time per letter was not significantly different between groups for horizontal motion at 30°/s (p=0.707) or random motion at 30°/s (p=0.723). Therefore, the motor response times were similar between groups at both motion types. Smooth pursuit gains were not…

Subjects/Keywords: Visual acuity; Sports vision; Eye movement; Vision strategies

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yee, A. (2017). Investigation of vision strategies used in a dynamic visual acuity task. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/12575

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yee, Alan. “Investigation of vision strategies used in a dynamic visual acuity task.” 2017. Thesis, University of Waterloo. Accessed January 18, 2021. http://hdl.handle.net/10012/12575.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yee, Alan. “Investigation of vision strategies used in a dynamic visual acuity task.” 2017. Web. 18 Jan 2021.

Vancouver:

Yee A. Investigation of vision strategies used in a dynamic visual acuity task. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10012/12575.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yee A. Investigation of vision strategies used in a dynamic visual acuity task. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/12575

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Johannesburg

24. Rubin, Alan. Surfaces of constant visual acuity in symmetric dioptric power space.

Degree: 2012, University of Johannesburg

URL: http://hdl.handle.net/10210/6695

►

D.Phil.

Visual acuity and refractive state probably are the two most basic or fundamental quantities that concern optometry, ophthalmology and vision science. Both of these… (more)

▼

D.Phil.

Visual acuity and refractive state probably are the two most basic or fundamental quantities that concern optometry, ophthalmology and vision science. Both of these variables are complicated and their mathematical and statistical use in research and other activities has been poorly understood. During particularly the last decade, modern statistical multivariate methods have become available to optometry and ophthalmology and this has assisted with the understanding of concepts such as refractive state (and its underlying nature, namely, dioptric power). It is now possible to transform measurements of refractive state from the conventional notation that is commonly used in the fields of optometry and ophthalmology to an orthodox mathematical form that can be understood by scientists and mathematicians. With this matrix form of refractive state it then is possible to use appropriate methods of linear algebra and multivariate statistics. Other theoretical approaches and analytical procedures or methods also have become accessible or have been developed recently as a consequence of this significant shift in thought as regards the fundamental nature of dioptric power. On the other hand, the scientific understanding of visual acuity (that is, the measurement of the resolving ability of the eye) perhaps has been somewhat neglected. Certainly there has been an abundance of research involving visual acuity and there also has been discussion concerning some of the difficulties that become apparent when measuring or attempting to interpret results from studies involving visual acuity. Visual acuity, unlike refractive state, can be represented by means of a single number and thus univariate, rather than multivariate, statistical methods are appropriate. And, of course, univariate statistics is less complicated than the multivariate form. But there are various difficulties with the understanding and researching of visual acuity. Some of these difficulties are relatively simple and thus can be solved more easily. For example, visual acuity measurements can be obtained from charts designed according to a logarithmic scale, or measurements from other charts can be transformed to a logarithmic scale. And thereby the ordinal nature of the basic or more common visual acuity scale is avoided and certain statistical methods become available that otherwise would not be possible. But more fundamentally visual acuity probably cannot truly be considered without the subject from which the measurement is obtained and, more particularly, the refractive state of the eye concerned. So the visual acuity and refractive state of an eye, perhaps, should be more appropriately regarded as a unitary concept that ideally should not be separated into two distinct parts. Thus to truly understand the relationship between visual acuity and refractive state we need to understand the 4-dimensional (mathematical) nature of the particular relationship involved. It follows then that the relationship between visual acuity and refractive state is a…

Subjects/Keywords: Visual acuity; Eye – Accommodation and refraction; Multivariate analysis; Refraction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rubin, A. (2012). Surfaces of constant visual acuity in symmetric dioptric power space. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/6695

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rubin, Alan. “Surfaces of constant visual acuity in symmetric dioptric power space.” 2012. Thesis, University of Johannesburg. Accessed January 18, 2021. http://hdl.handle.net/10210/6695.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rubin, Alan. “Surfaces of constant visual acuity in symmetric dioptric power space.” 2012. Web. 18 Jan 2021.

Vancouver:

Rubin A. Surfaces of constant visual acuity in symmetric dioptric power space. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10210/6695.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rubin A. Surfaces of constant visual acuity in symmetric dioptric power space. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/6695

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado State University

25. Wang, Hsiao-Hui. Retinal ganglion cell distribution and visual acuity in alpacas (Vicugna pacos).

Degree: MS(M.S.), Biomedical Sciences, 2013, Colorado State University

URL: http://hdl.handle.net/10217/81060

► Vision reflects the visual demand for environmental adaptation of an animal and also implies the biological niche of a species. Retinal specializations, such as visual… (more)

Subjects/Keywords: alpaca; Brn-3a; camelid; retinal ganglion cell; topography; visual acuity

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APA (6^th Edition):

Wang, H. (2013). Retinal ganglion cell distribution and visual acuity in alpacas (Vicugna pacos). (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/81060

Chicago Manual of Style (16^th Edition):

Wang, Hsiao-Hui. “Retinal ganglion cell distribution and visual acuity in alpacas (Vicugna pacos).” 2013. Masters Thesis, Colorado State University. Accessed January 18, 2021. http://hdl.handle.net/10217/81060.

MLA Handbook (7^th Edition):

Wang, Hsiao-Hui. “Retinal ganglion cell distribution and visual acuity in alpacas (Vicugna pacos).” 2013. Web. 18 Jan 2021.

Vancouver:

Wang H. Retinal ganglion cell distribution and visual acuity in alpacas (Vicugna pacos). [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10217/81060.

Council of Science Editors:

Wang H. Retinal ganglion cell distribution and visual acuity in alpacas (Vicugna pacos). [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/81060

Univerzitet u Beogradu

26. Kovačević, Igor M. 1976-. Uticaj dužine trajanja odvojenosti makule kod ablacije retine na vidnu oštrinubolesnika operisanih klasičnom metodom.

Degree: Medicinski fakultet, 2015, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:7141/bdef:Content/get

►

Oftalmologija - Vitreoretinalna hirurgija / Ophthalmology - Vitreoretinal surgery Datum odbrane: 26.06.2013.

Cilj: Analizirati rezultate operacije ablacije retine (AR) klasičnom metodom kod nekomplikovanih AR sa… (more)

Subjects/Keywords: retinal detachment; scleral buckling; duration of macular detachment; visual acuity

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APA (6^th Edition):

Kovačević, I. M. 1. (2015). Uticaj dužine trajanja odvojenosti makule kod ablacije retine na vidnu oštrinubolesnika operisanih klasičnom metodom. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:7141/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kovačević, Igor M 1976-. “Uticaj dužine trajanja odvojenosti makule kod ablacije retine na vidnu oštrinubolesnika operisanih klasičnom metodom.” 2015. Thesis, Univerzitet u Beogradu. Accessed January 18, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:7141/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kovačević, Igor M 1976-. “Uticaj dužine trajanja odvojenosti makule kod ablacije retine na vidnu oštrinubolesnika operisanih klasičnom metodom.” 2015. Web. 18 Jan 2021.

Vancouver:

Kovačević IM1. Uticaj dužine trajanja odvojenosti makule kod ablacije retine na vidnu oštrinubolesnika operisanih klasičnom metodom. [Internet] [Thesis]. Univerzitet u Beogradu; 2015. [cited 2021 Jan 18]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:7141/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kovačević IM1. Uticaj dužine trajanja odvojenosti makule kod ablacije retine na vidnu oštrinubolesnika operisanih klasičnom metodom. [Thesis]. Univerzitet u Beogradu; 2015. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:7141/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

27. Rangaraju, LakshmiPriya. Alterations in Retinal Layer Metrics and Their Association with Visual Acuity in Diabetic Retinopathy.

Degree: 2017, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/21795

► Diabetic Retinopathy (DR), which is the most serious ocular complication of diabetes, causes alterations in retinal structure, leading to visual acuity (VA) loss. Proper assessment… (more)

▼ Diabetic Retinopathy (DR), which is the most serious ocular complication of diabetes, causes alterations in retinal structure, leading to visual acuity (VA) loss. Proper assessment and monitoring of the disease progression with timely therapeutic intervention can help prevent vision loss due to DR. Previous studies have reported changes in retinal layer thickness due to DR and their association with VA, as well as changes in retinal layer reflectance and organization. However, concurrent assessment of these metrics and their relationship with VA has not been reported. In the current study, our primary aim was to determine the associations of retinal layer thickness, retinal layer reflectance, and retinal layer disruption with VA. Quantitative retinal metrics were obtained from optical coherence tomography (OCT) images in 149 diabetic patients, categorized into three groups: no DR (N=50) non-proliferative DR (NPDR; N=59) proliferative DR (PDR; N=40). In a follow-up study, 23 of these patients were imaged at a second visit to evaluate changes in retinal layer metrics over time. The OCT images were analyzed using a semi-automated image segmentation software to identify 7 different retinal layers and generate en face thickness maps and reflectance images. ANOVA identified significant differences in thickness of the central subfield (CST) among three groups (P=0.01). VA and thickness of three retinal structures: CST, INL and OPL were correlated significantly (ρ>0.24; P<0.001), such that increased thickness was associated with reduced acuity. VA and NFL reflectance were correlated significantly (ρ=-0.24; P=0.003), such that subjects with higher reflectance had better VA. Lower OSL reflectance was correlated with lower VA (ρ=-0.29; P<0.001). Subjects with disruptions in the INL and ONL had lower VA compared to subjects with no disruptions in these interfaces (P<0.001). In the follow-up study, RPE and OSL thickness were significantly different between two visits. These results indicate that assessment of specific retinal structures may be helpful for monitoring visual outcome due to DR. Similarly, reflectance alterations, which are not commonly evaluated, may provide additional important information. Finally, changes in selected retinal thickness can be observed over a relatively short time in DR, with significant thickening observed in the RPE and OSL. Advisors/Committee Members: McAnany, Jason (advisor), Shahidi, Mahnaz (advisor), Hetling, John R (committee member), McAnany, Jason (chair).

Subjects/Keywords: diabetic retinopathy; optical coherence tomography; Retinal Layer; Visual Acuity

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APA (6^th Edition):

Rangaraju, L. (2017). Alterations in Retinal Layer Metrics and Their Association with Visual Acuity in Diabetic Retinopathy. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/21795

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rangaraju, LakshmiPriya. “Alterations in Retinal Layer Metrics and Their Association with Visual Acuity in Diabetic Retinopathy.” 2017. Thesis, University of Illinois – Chicago. Accessed January 18, 2021. http://hdl.handle.net/10027/21795.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rangaraju, LakshmiPriya. “Alterations in Retinal Layer Metrics and Their Association with Visual Acuity in Diabetic Retinopathy.” 2017. Web. 18 Jan 2021.

Vancouver:

Rangaraju L. Alterations in Retinal Layer Metrics and Their Association with Visual Acuity in Diabetic Retinopathy. [Internet] [Thesis]. University of Illinois – Chicago; 2017. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10027/21795.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rangaraju L. Alterations in Retinal Layer Metrics and Their Association with Visual Acuity in Diabetic Retinopathy. [Thesis]. University of Illinois – Chicago; 2017. Available from: http://hdl.handle.net/10027/21795

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Linköping University

28. Cederlund, Joakim. Eye preference in humans and its correlation with eye dominance, visual acuity and handedness.

Degree: Biology, 2016, Linköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129460

► Handedness is the most obvious expression of lateralized behaviour in humans. However, there is only limited knowledge about other forms of lateralized behaviour, e.g.… (more)

Subjects/Keywords: Eye preference; handedness; visual acuity; eye dominance; correlation.

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APA (6^th Edition):

Cederlund, J. (2016). Eye preference in humans and its correlation with eye dominance, visual acuity and handedness. (Thesis). Linköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129460

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cederlund, Joakim. “Eye preference in humans and its correlation with eye dominance, visual acuity and handedness.” 2016. Thesis, Linköping University. Accessed January 18, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129460.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cederlund, Joakim. “Eye preference in humans and its correlation with eye dominance, visual acuity and handedness.” 2016. Web. 18 Jan 2021.

Vancouver:

Cederlund J. Eye preference in humans and its correlation with eye dominance, visual acuity and handedness. [Internet] [Thesis]. Linköping University; 2016. [cited 2021 Jan 18]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129460.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cederlund J. Eye preference in humans and its correlation with eye dominance, visual acuity and handedness. [Thesis]. Linköping University; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129460

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Arizona

29. Duncan, William J. Visual Acuity Estimation from Simulated Images .

Degree: 2016, University of Arizona

URL: http://hdl.handle.net/10150/613300

► Simulated images can provide insight into the performance of optical systems, especially those with complicated features. Many modern solutions for presbyopia and cataracts feature sophisticated… (more)

Subjects/Keywords: ophthalmic; simulated images; Visual acuity; Optical Sciences; multifocal

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APA (6^th Edition):

Duncan, W. J. (2016). Visual Acuity Estimation from Simulated Images . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/613300

Chicago Manual of Style (16^th Edition):

Duncan, William J. “Visual Acuity Estimation from Simulated Images .” 2016. Doctoral Dissertation, University of Arizona. Accessed January 18, 2021. http://hdl.handle.net/10150/613300.

MLA Handbook (7^th Edition):

Duncan, William J. “Visual Acuity Estimation from Simulated Images .” 2016. Web. 18 Jan 2021.

Vancouver:

Duncan WJ. Visual Acuity Estimation from Simulated Images . [Internet] [Doctoral dissertation]. University of Arizona; 2016. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10150/613300.

Council of Science Editors:

Duncan WJ. Visual Acuity Estimation from Simulated Images . [Doctoral Dissertation]. University of Arizona; 2016. Available from: http://hdl.handle.net/10150/613300

Clemson University

30. Sewall, Ashley. Observers' Judgments of the Effects of Glare on Visual Acuity.

Degree: MS, Applied Psychology, 2012, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/1523

► Traffic collisions and pedestrian fatalities increase significantly when driving at night. There is a need for greater roadway visibility when driving at night and the… (more)

Subjects/Keywords: headlight glare; stimulus contrast; transportation safety; visual acuity; Psychology

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APA (6^th Edition):

Sewall, A. (2012). Observers' Judgments of the Effects of Glare on Visual Acuity. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1523

Chicago Manual of Style (16^th Edition):

Sewall, Ashley. “Observers' Judgments of the Effects of Glare on Visual Acuity.” 2012. Masters Thesis, Clemson University. Accessed January 18, 2021. https://tigerprints.clemson.edu/all_theses/1523.

MLA Handbook (7^th Edition):

Sewall, Ashley. “Observers' Judgments of the Effects of Glare on Visual Acuity.” 2012. Web. 18 Jan 2021.

Vancouver:

Sewall A. Observers' Judgments of the Effects of Glare on Visual Acuity. [Internet] [Masters thesis]. Clemson University; 2012. [cited 2021 Jan 18]. Available from: https://tigerprints.clemson.edu/all_theses/1523.

Council of Science Editors:

Sewall A. Observers' Judgments of the Effects of Glare on Visual Acuity. [Masters Thesis]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_theses/1523

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