Abstract
Based on a binocular adaptive optics visual simulator, we investigated the effect of higher-order aberration correction on the temporal integration property of stereopsis. Stereo threshold for line stimuli, viewed in 550nm monochromatic light, was measured as a function of exposure duration, with higher-order aberrations uncorrected, binocularly corrected or monocularly corrected. Under all optical conditions, stereo threshold decreased with increasing exposure duration until a steady-state threshold was reached. The critical duration was determined by a quadratic summation model and the high goodness of fit suggested this model was reasonable. For normal subjects, the slope for stereo threshold versus exposure duration was about -0.5 on logarithmic coordinates, and the critical duration was about 200 ms. Both the slope and the critical duration were independent of the optical condition of the eye, showing no significant effect of higher-order aberration correction on the temporal integration property of stereopsis.
Highlights
Living in a three-dimensional world, it is crucial for us to know about the depth information of space objects
In an earlier paper [16], employing a binocular adaptive optics visual simulator (BAOVS), we demonstrated that dynamic Higher-order aberration (HOA) correction using adaptive optics had a significant effect on stereopsis and the stereo benefit was related to the exposure duration
The largest benefit occurred for the left eye of Subject 4 at the spatial frequency of 16 cpd, Subject 1 had the largest amount of HOAs corrected
Summary
Living in a three-dimensional world, it is crucial for us to know about the depth information of space objects. The retinal image of human eye is two-dimensional, from which depth information cannot be directly obtained. There are various cues that the human visual system can employ to recover depth information, such as occlusion, perspective, motion parallax and stereopsis. Among these cues to depth, stereopsis has been proved to be the most accurate one. Based on the detection of binocular disparity that originates from the slightly different point of view of the two horizontally separate eyes, we can discriminate a depth difference smaller than the size of a photoreceptor [1]. Stereopsis is routinely tested as a screening for visual disorders
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