To see the other types of publications on this topic, follow the link: Contrast sensitivity.

Dissertations / Theses on the topic 'Contrast sensitivity'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Contrast sensitivity.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

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

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
4

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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).
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
30

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
43

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
44

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

Full text
APA, Harvard, Vancouver, ISO, and other styles
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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
49

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!