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PM Fredenburg, RS Harwerth, EL Smith; Stereopsis and Viewing Duration for Normal and Abnormal Binocular Vision . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4676.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To determine if temporal integration for stereopsis in patients with subnormal binocular vision is abnormal. Methods:9 monkeys and 7 humans with normal or subnormal binocular vision were subjects. Psychophysical stereothresholds were determined for local and global stimuli for viewing durations of 16 to 1000 msec. The longest viewing duration for intensity-time reciprocity and the stereothreshold that was independent of viewing duration were determined by nonlinear regression. Results:The critical duration for stereopsis was similar across all of the subjects and was not affected by factors such as type of stereogram, contrast, or spatial frequency. Conclusion:The intensity-time functions for stereopsis follow Bloch's law and are consistent with psychophysical data for other types of stimuli. The similarity in the critical durations of stereo-normal and stereo-deficient subjects suggests that clinically elevated stereoacuities are not caused by neural inefficiencies that require longer viewing durations to achieve maximal performance.
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