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Contrast (vision)

About: Contrast (vision) is a research topic. Over the lifetime, 10379 publications have been published within this topic receiving 221480 citations.


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Journal ArticleDOI
TL;DR: It is concluded that binocular contrast summation decreases as background contrast rises, revealing a dependence of binocular summation on background contrast.

180 citations

Journal ArticleDOI
TL;DR: Temporal contrast sensitivity for counterphase flicker was determined for specifically disabled and normal readers to investigate whether the two groups differ in the functioning of their transient systems, supporting the hypothesis of a transient-system deficit in the visual systems of disabled readers.
Abstract: Temporal contrast sensitivity for counterphase flicker was determined for specifically disabled and normal readers to investigate whether the two groups differ in the functioning of their transient systems. In experiment 1, temporal contrast sensitivity was measured over a range of temporal frequencies with a spatial frequency of 2 cycles deg-1. Disabled readers were less sensitive than the control subjects at all temporal frequencies. In experiment 2, temporal contrast sensitivity was measured at a temporal frequency of 20 Hz over a range of spatial frequencies. Disabled readers were less sensitive than the controls at all spatial frequencies, with the differences between the groups increasing as spatial frequency increased. Both these findings are interpreted as supporting the hypothesis of a transient-system deficit in the visual systems of disabled readers.

180 citations

Journal ArticleDOI
TL;DR: The results suggest that magnocellular cells are well suited for the detection of any spatially localized change, be it the result of luminance or wavelength change.

179 citations

Journal ArticleDOI
TL;DR: Subjects adjusted the luminances of 16 or 25 circles, all visible at the same time on a computer monitor, to make equal-interval brightness series, showing a sharp minimum at the background luminance, Lb: the Crispening Effect.

179 citations

Journal Article
TL;DR: Glaucoma is associated with a modest decrease in mobility performance, and walking speed decreases with severity of the disease as estimated by threshold perimetry.
Abstract: PURPOSE. To determine whether glaucoma affects mobility performance and whether there is a relationship between mobility performance and stage of disease as estimated from vision‐function measures. METHODS. The mobility performance of 47 glaucoma subjects was compared with that of 47 normal‐vision subjects who were of similar age. Mobility performance was assessed by the time required to complete an established travel path and the number of mobility incidents. The subjective assessment of falling and fear of falling were also compared. Vision function was assessed by measures of visual acuity, contrast sensitivity, monocular automated threshold perimetry, and suprathreshold; binocular visual fields were assessed with the Esterman test. RESULTS. The glaucoma subjects walked on average 10% more slowly than did the normal‐vision subjects. The number of people who experienced bumps, stumbles, or orientation problems was almost twice as high in the glaucoma group than the normal‐vision group, but the difference did not reach statistical significance. The difference between groups also was not significant with respect to the number of people who reported falling in the past year (38% for the glaucoma group and 30% for the normal‐vision group) or a fear of falling (28% for the glaucoma group and 23% for the normal‐vision group). The visual fields assessed with a Humphrey 24-2 test were more highly correlated with walking speed in glaucoma than the visual fields scored by the Esterman scale or than visual acuity or contrast sensitivity. CONCLUSIONS. Glaucoma is associated with a modest decrease in mobility performance. Walking speed decreases with severity of the disease as estimated by threshold perimetry. (Invest Ophthalmol Vis Sci. 1999;40:2803‐2809)

178 citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20231,864
20223,760
2021413
2020329
2019354