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Dissertations / Theses on the topic 'Contrast sensitivity'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ghim, Mimi M. "Spatial contrast sensitivity of birds." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/65.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2003.<br>Thesis research directed by: Psychology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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2

Olesko, Brian M. "Dynamic contrast sensitivity : methods and measurements /." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09052009-040416/.

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3

Barten, Peter G. J. "Contrast sensitivity of the human eye and its effects on image quality." Bellingham, Wash. (1000 20th St. Bellingham WA 98225-6705 USA) : SPIE, 1999. http://dx.doi.org/10.1117/3.353254.

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Thesis (doctoral)--Technische Universiteit Eindhoven, 1999.<br>"SPIE digital library." Originally published: Knegsel : HV Press, 1999. Includes bibliographical references and index. Also available in print version.

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4

Ukkonen, Outi I. "Contrast sensitivity for complex and random gratings." Thesis, Aston University, 1995. http://publications.aston.ac.uk/14610/.

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This thesis studied the effect of (i) the number of grating components and (ii) parameter randomisation on root-mean-square (r.m.s.) contrast sensitivity and spatial integration. The effectiveness of spatial integration without external spatial noise depended on the number of equally spaced orientation components in the sum of gratings. The critical area marking the saturation of spatial integration was found to decrease when the number of components increased from 1 to 5-6 but increased again at 8-16 components. The critical area behaved similarly as a function of the number of grating compon

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5

Drover, James R. "Modification of the infant contrast sensitivity card procedure." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ55503.pdf.

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6

Yap, M. K. H. "Clinical application of contrast sensitivity in visual dysfunction." Thesis, University of Bradford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371489.

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7

Tunnacliffe, A. H. "Contrast sensitivity as an indicator of binocular function." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376693.

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8

Osman, Mawada. "Contrast Sensitivity and Visual Acuity among the Elderly." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586874623985066.

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9

Mason, Alexandra J. S. "The contrast sensitivity of three groups of opthalmological patients." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336141.

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10

Grey, C. P. "Changes in contrast sensitivity during soft contact lens wear." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376712.

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11

Ong, Gek-Lim. "Instrumentation for automated contrast-sensitivity and colour-vision tests." Thesis, University of Sussex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270712.

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12

Persaud, Steven S. "Contrast Sensitivity to One- and Two-Dimensional Luminance Patterns." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/9910.

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Contrast sensitivities to one- and two-dimensional luminance patterns were compared in a two-alternative forced choice (2AFC) experiment. Space-averaged luminance was also manipulated. Statistical analyses revealed a main effect of stimulus dimension (p < .05) and no effect of space-averaged luminance. The main effect of stimulus dimension was explained in terms of an on-center, off-center receptive field model combined with watershed spatial vision behavior at spatial frequencies below 1 cycle-per-degree (cpd). The non-significant result for space-averaged luminance was explained by the limit

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13

Young, Anthony M. "Investigation of Laser Speckle Contrast Imaging's Sensitivity to Flow." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami153256524246362.

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14

Njeru, Steve Murimi Mathenge. "Contrast Sensitivity and Visual Acuity in Low-Vision Students." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586966057072378.

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15

Croxton, Craig A. "The effects of target orientation on the dynamic contrast sensitivity function." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09052009-040820/.

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16

Adams, William F. "The effects of target vibration on the human contrast sensitivity function." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-11102009-020033/.

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17

Govan, Donovan G., and n/a. "Luminance and contrast as depth cues." University of Otago. Department of Psychology, 2007. http://adt.otago.ac.nz./public/adt-NZDU20080129.112322.

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It has long been held that luminance acts as a cue for depth perception. But varying the luminance of a stimulus inevitably alters its contrast with its background. Recent research shows that contrast is a depth cue. I have distinguished two kinds of contrast, external contrast, the contrast of a stimulus with its background, and internal contrast, the contrast within the stimulus. I compared the relative apparent depth of two stimuli (both directly and indirectly; stimuli were either sine-wave filled hemifields, sine-wave filled squares, or plain squares), as their luminances and internal con

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18

Dahl, Howard Stewart. "Comparison of spatial contrast sensitivity between younger and older observers." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25373.

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Contrast sensitivity to vertically oriented grating patterns with a sinusoidal luminance profile were examined between groups of observers varying either in gender or age. For each observer at each of the seven spatial frequencies tested (.75, 1.5, 3, 6, 7.5, 10, 15 cyc/deg) threshold values were calculated for either ascending or descending trials as well as a combination of both. These threshold values were numerically transformed into sensitivity values and contributed to a group mean contrast sensitivity score for each spatial frequency. No significant effect of gender was found but younge

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19

Lynk, Lisa. "Aging effects of binocular summation on contrast sensitivity and hyperacuity." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0009/MQ34976.pdf.

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20

Hood, Alison S. "The dependence of binocular contrast sensitivity on binocular single vision." Thesis, University of Glasgow, 1999. http://theses.gla.ac.uk/6253/.

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This study involved the determination of the effects of binocular viewing on contrast sensitivities in 11 normal subjects and in different categories of amblyopes. These were simple anisometropic amblyopes (n=9), micro-esotropic amblyopes with anomalous BSV (n=6), esotropic amblyopes with anomalous BSV (n=3) esotropic without BSV 9n=5), exotropic amblyopes without BSV (n=2) and a group of non-amblyopic strabismics (non-amblyopic esotropes without BSV (n=4); non-amblyopic exotropes without BSV (n=2).An ophthalmic examination was carried out on all individuals. The examination procedures underta

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21

Zavod, Merrill. "THE EFFECTS OF STIMULUS MOTION ON CONTRAST SENSITIVITY: DYNAMIC SENSI." Doctoral diss., University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3724.

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Static Visual Acuity (SVA) has been called into question for some time as a measure of overall visual system function and as a predictor of performance on real-life tasks requiring vision (i.e., operating an automobile). Specifically, it has been pointed out that the targets employed in most SVA testing (high contrast, stationary letters) are an insufficient analog to actual targets encountered in everyday activities, which are often in motion and/or of less-than-perfect contrast. In addition, the size-threshold methodology typically used to measure SVA is incongruent with current theories of

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22

Tumblin, John Erwin (Jack). "Three methods of detail-preserving contrast reduction for displayed images." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13080.

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23

Sharma, Saloni. "The effect of L-dopa on contrast sensitivity in normal subjects using functional magnetic resonance imaging." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=2973.

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Thesis (M.S.)--West Virginia University, 2003.<br>Title from document title page. Document formatted into pages; contains xi, 101 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 95-99).

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24

Griffiths, Stella N. "The effect of intraocular scattered light on the contrast sensitivity function." Thesis, Aston University, 1986. http://publications.aston.ac.uk/14587/.

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Intraocular light scatter is high in certain subject groups eg the elderly, due to increased optical media turbidity, which scatters and attenuates light travelling towards the retina. This causes reduced retinal contrast especially in the presence of glare light. Such subjects have depressed Contrast Sensitivity Functions (CSF). Currently available clinical tests do not effectively reflect this visual disability. Intraocular light scatter may be quantified by measuring the CSF with and without glare light and calculating Light Scatter Factors (LSF). To record the CSF on clinically available e

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25

Martins, Cristiane Maria Gomes. "Impacto da catarata congênita na sensibilidade ao contraste espacial de luminância em crianças." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/47/47135/tde-15032013-105656/.

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A opacificação do cristalino presente ao nascimento ou nos primeiros meses de vida é denominada de Catarata Congênita (CC). As primeiras semanas de vida são importantes no desenvolvimento visual, já que há diferença significativa no desempenho visual de crianças que passaram pela cirurgia até seis semanas de vida (com melhor desempenho visual) em relação às crianças que realizaram a cirurgia após seis semanas de vida. Crianças que tiveram privação visual durante a primeira infância por catarata bilateral apresentam redução da visão espacial. O objetivo deste trabalho foi verificar o impacto na

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26

Masson, Andrªe P. "The effect of aging and visual impairments on spatio-temporal contrast sensitivity." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25919.pdf.

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27

Perron, Adena Marie. "The effect of vigabatrin treatment on contrast sensitivity in a pediatric population." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63152.pdf.

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28

Diamond, Mark R. "The effect of saccades on visual sensitivity and time perception /." Connect to this title, 2002. http://theses.library.uwa.edu.au/adt-WU2003.0038.

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29

Thomas, Kathleen Theresa. "Do colored overlays improve reading? : a test of the Irlen effect /." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06162009-063332/.

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30

Midgley, Caroline Ann. "Binocular interactions in human vision." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4839/.

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Early visual processing is subject to binocular interactions because cells in striate cortex show binocular responses and ocular dominance (Hubel & Weisel, 1968). The work presented in this thesis suggests that these physiological interactions can be revealed in psychophysical experiments using normal human observers. In the region corresponding to the blind spot, where binocular interactions differ from areas of the visual field which are represented by two eyes, monocular contrast sensitivity is increased. This finding can be partially explained by an absence of normal binocular interactions

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31

Ledeatte, Barry Anderson. "Spatial summation in the human visual system." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243775.

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32

Moreira, Sonia Maria Cipriani Fersura. "Desenvolvimento da sensibilidade ao contraste de luminância espacial e temporal." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/47/47132/tde-21102010-110538/.

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Objetivo: Avaliar a Função de Sensibilidade ao Contraste de Luminância Espacial e Temporal, estudar o desenvolvimento destas funções, a contribuição das vias de processamento paralelo para as funções de Sensibilidade ao Contraste e seu respectivo desenvolvimento e, por fim, determinar valores normativos destas funções visando uma aplicabilidade clínica.Método A avaliação psicofísica de sensibilidade ao contraste de luminância espacial e temporal foi realizada em 112 sujeitos divididos em três grupos:GrupoI ( idade média =9,14±2,7 anos),Grupo II ( idade média=23,7 ± 3,4 anos) e Grupo III ( idad

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33

Khalil, Nofal Mohammed. "Investigations of visual function in migraine by visual evoked potentials and visual psychophysical tests." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/8336.

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34

Wagge, Jordan Rose. "Contributions of response gain and contrast gain to human spatial pattern masking." Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1250003782.

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35

Mekaroonreung, Haruetai. "Trait-Based Individual Differences on Discomfort Glare Rating Responses and Related Visual Contrast Sensitivity." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/43879.

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This research was designed to investigate the relationship between Trait-based Individual differences (neuroticism and extraversion) and glare subjective responses as well as the actual contrast sensitivity when exposed to the same manipulated glare condition. In addition, the relationship between the glare subjective responses and actual contrast sensitivity was investigated. To examine the trait-based individual differences, the International Personality Item Pool (IPIP) was used while the subjective glare experience was examined utilizing modified glare discomfort rating scale. The visual

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36

Mustonen, Juvi K. "Spatial contrast sensitivity and external noise: applications to optical and neural modulation transfer functions." Thesis, Aston University, 1995. http://publications.aston.ac.uk/14551/.

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The thesis will show how to equalise the effect of quantal noise across spatial frequencies by keeping the retinal flux (If-2) constant. In addition, quantal noise is used to study the effect of grating area and spatial frequency on contrast sensitivity resulting in the extension of the new contrast detection model describing the human contrast detection system as a simple image processor. According to the model the human contrast detection system comprises low-pass filtering due to ocular optics, addition of light dependent noise at the event of quantal absorption, high-pass filtering due to

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37

Longley, Christopher I. "Contrast sensitivity and glare : new measurement techniques and the visual consequences of wearing head-mounted displays." Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/16061.

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The main aim of this thesis was to evaluate the performance of the contrast sensitivity clock (CSC), a new screening device for measuring contrast sensitivity (CS) and glare. This device allows CS without glare, with glare and disability glare scores to be recorded. After initial data collection the design of the CSC was slightly amended improving the performance of the device. The amended design of the CSC was shown to be a valid, discriminative and repeatable measure for purpose. The CSC is also a quick test to perform and is relatively cheap to produce. If all these factors are considered i

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38

Haller, Nicola Kristin [Verfasser]. "The influence of motion on spatial contrast sensitivity in budgerigars (Melopsittacus undulatus) / Nicola Kristin Haller." Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2014. http://d-nb.info/1064863604/34.

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39

Hopkins, Gregory Robert II. "Contrast sensitivity and vision-related quality of life assessment in the pediatric low vision population." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397751785.

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40

Kim, Kerry Justin. "Sites and mechanisms of temporal contrast adaptation in the salamander retina /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10542.

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41

Bontrager, Jordan G. "Characterization and Applications for A Polymerized DiaCEST Contrast Agent." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/577329.

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MRI can benefit from an increase in the sensitivity of contrast agents. The CEST MRI technique in particular suffers from very poor sensitivity when using diamagnetic contrast agents. Polymerized CEST MRI contrast agents could increase the sensitivity per macromolecule over monomer contrast agents. The increase in sensitivity is related to the increase in number of contrast agents per polymer. A contrast agent with increased sensitivity can be used to image on the molecular level in vivo, where the concentration of targets is very low. A polymerized diaCEST contrast agent was synthesized by co

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42

Henderson, Albert Steven. "Contrast sensitivity for drifting sine wave gratings in near visual periphery predicts older drivers' accident risk." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104505.

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Drivers over the age of 70 have a significantly higher rate of intersection collisions than younger drivers. Many of their accidents involve a visual detection error, resulting in a right-of-way violation and a collision with an oncoming vehicle. Three studies relating older drivers' peripheral motion detection to accident risk demonstrate that peripheral motion contrast threshold (PMCT) for low spatial frequency drifting sine wave gratings significantly declines with age, and that PMCT predicts about 40% of driving performance variance (p > .001). Approximately twenty older drivers participat

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43

Hackett, Deborah Anne. "Exploring the mechanisms of Rarebit perimetry." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/5729.

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Visual field testing, or perimetry, measures peripheral visual loss in eye diseases such as glaucoma. Rarebit Perimetry (RBP) is a new and novel perimetric method, introduced in 2002 by Lars Frisén (2002), with the aim of detecting low degrees of neural damage within the retina.<br>RBP is unlike conventional perimetric methods that measure levels of retinal sensitivity, but instead uses very bright (i.e. suprathreshold) and very small targets to detect tiny areas of absolute blindness within otherwise normal areas of vision. RBP thus claims to locate miniscule gaps in the receptive field mat

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44

Friström, Björn. "Aspects of the diagnosis and treatment of glaucoma /." Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/med690s.pdf.

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45

Alencar, Caroline Dias da Costa. "Efeitos da desnutrição proteica na percepção de contraste e acuidade visual em humanos e em ratos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/47/47135/tde-17032015-124043/.

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O objetivo do presente estudo foi avaliar o efeito da desnutrição proteica em humanos e em modelo animal por meio de medidas comportamentais e bioquímicas. Participaram desse estudo 60 crianças com idade de 7 a 10 anos, sendo 20 eutróficas (grupo controle, GC), 20 com desnutrição atual (grupo experimental atual, GEa) e 20 com desnutrição pregressa (grupo experimental pregresso, GEp). Esses três grupos foram replicados em modelo animal, sendo cada grupo composto por 6 ratos wistar. A acuidade visual (AV) e a sensibilidade ao contraste (SC) foram medidas por meio do método psicofísico em humanos

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46

Diamond, Mark R. "The effect of saccades on visual sensitivity and time perception." University of Western Australia. School of Psychology, 2003. http://theses.library.uwa.edu.au/adt-WU2003.0038.

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Considerable evidence indicates that visual sensitivity is reduced during saccadic eye movement. A central question has been whether saccadic suppression results from a non-visual central signal, or whether the obligate image motion that accompanies saccades is itself sufficient to mask vision. In the first of a series of experiments described here, the visual and non-visual effects of saccades were distinguished by measuring contrast sensitivity to luminance modulated low spatial frequency gratings, at 17 cd·m¯² and 0.17 cd·m¯², in saccade conditions and in conditions in which saccade-like im

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47

Lewis, Peter. "Improving Peripheral Vision Through Optical Correction and Stimulus Motion." Doctoral thesis, Linnéuniversitetet, Institutionen för medicin och optometri (MEO), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-52286.

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The loss of central vision subsequent to macular disease is often extremely debilitating. People with central field loss (CFL) must use other peripheral areas of the retina in order to see; areas with inferior resolution capacity, which are also affected by off-axis optical errors. The overall aim of the work encompassed by this thesis was to identify and evaluate methods of improving vision for people with CFL; with focus on the effects of off-axis optical correction and stimulus motion on resolution acuity and contrast sensitivity. Off-axis optical errors were measured using a commercially-a

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48

Reinhardt, Juliane [Verfasser], and Christian G. [Akademischer Betreuer] Schroer. "Resonant Hard X-ray Ptychography for High-Sensitivity Imaging with Chemical Contrast / Juliane Reinhardt ; Betreuer: Christian G. Schroer." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1139493051/34.

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Klein, Johann Oliver. "Contrast sensitivity loss in patients presenting with cataract and early stage glaucoma using methods suitable for clinical use." Thesis, Ulster University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646850.

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Glaucoma is an insidious progressive disease that leads to a permanent loss of vision if left untreated. The development of methods for early detection of the disease is essential as early diagnosis and treatment significantly reduces the risk of sight loss. Contrast sensitivity (CS) testing has shown the potential to detect glaucoma in its early stage. However, as glaucoma is mainly a disease of the elderly, comorbidity with cataract is common. The extent to which cataractous changes in glaucoma patients affect grating CS tests and how these effects depend on the type and severity of cataract

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50

Skinner, Fiona K. "Dopamine and visual function in schizophrenia : a psychophysical investigation using the tilt after-effect and contrast sensitivity tests." Thesis, University of Aberdeen, 1994. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU068528.

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The study used a non-invasive technique, the Tilt Aftereffect (TAE) test, to investigate the visual changes influenced by dopamine (DA) in schizophrenia. One-third of forty five schizophrenic patients could not complete the TAE test and this group was found to have impaired sustained attention and to have different demographic and clinical characteristics from the schizophrenic patients who could complete the TAE test. TAE changes were found only in response to DA changes brought about by altering neuroleptic levels, e.g. 'before' compared with 'after' a depot injection. These changes were onl

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