Stereo-anomalous vision in a sample of young adults

Lew B. Stelmach; Wa James Tam

doi:10.1117/12.238726

22 April 1996 Stereo-anomalous vision in a sample of young adults

Lew B. Stelmach, Wa James Tam

Proceedings Volume 2657, Human Vision and Electronic Imaging; (1996) https://doi.org/10.1117/12.238726
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

We estimated the proportion of people that have defective stereo vision and are unable to utilize stereo disparity information to perceive depth. Previous estimates have ranged anywhere from as high as 30% to as low as 6%. Our goal was to understand the basis for the wide range in these estimates. To do this, we administered two psychophysical tests to a sample of 100 young adults. Visual stimuli consisted of dynamic random-dot stereograms presented using a fast-decay, time-sequential display device. The stimuli covered a range of disparities between 0 and .38 degrees (both crossed and uncrossed). A forced-choice methodology was used to estimate whether subjects could perceive depth based on horizontal disparity. It was found that display duration was a key variable determining the number of viewers that were classified as stereo-anomalous. The relatively high incidence of stereo- anomalous viewers in previous research was explained by the short display durations (80 ms) used in those studies. With longer durations of about 1 sec, we found that only about 5% of viewers had defective stereo vision.

Citation Download Citation

Lew B. Stelmach and Wa James Tam "Stereo-anomalous vision in a sample of young adults", Proc. SPIE 2657, Human Vision and Electronic Imaging, (22 April 1996); https://doi.org/10.1117/12.238726

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