Wednesday, February 1, 2017

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Recovering stereo vision

Recovering stereo vision

Stereopsis is the impression of three-dimensionality—of objects “popping out in depth”—that most humans get when they view real-world objects with both eyes, based on binocular disparity—the differences between the two retinal images of the same world. However, a substantial proportion of the population is stereoblind or stereo deficient due to strabismus and/or amblyopia. This impairment may have a substantial impact on visuomotor tasks, difficulties in playing sports in children and locomoting safely in older adults.

 
 
Low Vision Support Group 2/1/17 Visual Impairment Services from Veterans Affairs
 
 
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Fast perception of binocular disparity

Fast perception of binocular disparity

Is depth perception from binocular disparities—stereopsis—slow or fast? Rapidly changing disparities are perceptually difficult to track, which suggests that stereopsis is generally slow, but the wide-spread belief in the slowness of stereo does not have good empirical support. Classic experiments in which stereo occurred slowly are difficult to interpret. We compared speed-accuracy tradeoff functions (SATFs) between two forced-choice discriminations: one based on stereoscopic depth, and one based on luminance.

 
 
 
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