Topic
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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TL;DR: In this article, a chicken eye can emmetropize without cues derived from accommodation or colour just by maximizing retinal image contrast, and the authors found that deprivation myopia is correlated with the amount of image degradation.
102 citations
TL;DR: The hypothesised transient system deficit in dyslexia was investigated in a study comparing 43 control with 39 dyslexic children who were matched for age, sex, and intelligence, and the following factors were found to be significantly associated with Dyslexia: reduced visual acuity, impaired flicker detection, reduced low spatial frequency contrast sensitivity, and slightly slower performance at a simulated reading visual search task.
102 citations
TL;DR: Stereothresholds appear to be elevated by binocular suppression evoked by interocular differences in contrast, predicted from positional disparities between edge features rather than from differences in spatial frequency.
102 citations
TL;DR: The detriment in color vision caused by yellow-colored lenses enhances contrast when viewing bright objects against a blue-based background, such as the sky.
Abstract: PURPOSE: Although many studies have shown a subjective preference for yellow lenses, there has been little success in determining the clinical nature of this benefit. METHOD: Contrast sensitivity, color vision, accommodative-convergence, and visual acuity were measured in a group of 20 young subjects along with subjective rating of their perception through clear control lenses (380-nm cut-off), yellow lenses (450-nm cut-off), dark yellow lenses (511-nm cut-off), and orange lenses (527-nm cut-off). RESULTS: A systematic detriment to color vision was found to occur with increasing cut-off wavelength of the yellow lenses (p < 0.001) and this was significantly correlated to subjective ratings of color (r = -0.66) and brightness (r = -0.34). Perceived brightness significantly improved for the yellow (450-nm cut-off) lens only (p < 0.001). Although tinted lenses reduced contrast sensitivity to a white on black grating, there was a significant improvement in low to midrange spatial frequencies when measured using a white-on-blue grating. CONCLUSIONS: The detriment in color vision caused by yellow-colored lenses enhances contrast when viewing bright objects against a blue-based background, such as the sky. Contrast of overlying objects is enhanced is due to the selective reduction of short-wavelength light by the yellow lenses.
102 citations
TL;DR: "Movement-detecting" units that respond little or not at all to illumination without movement, respond to change in position under stroboscopic light even when relatively large jumps in the visual field occur during a dark pause between two flashes.
Abstract: "Movement-detecting" units that respond little or not at all to illumination without movement, respond to change in position under stroboscopic light even when relatively large jumps in the visual field occur during a dark pause between two flashes. The threshold angle and angular velocity are different for different classes of units. They are higher for the periphery of the receptive field and increase with decreasing contrast. An inhibitory effect of a large surrounding of the receptive field coluld be demonstrated in class-2 neurvons.
102 citations