Finely graded binocular disparities from random-dot stereograms.
Rotation of a stereogram around an axis through its centre provides a method of presenting finely graded binocular disparities. Such displays are useful for clinical testing of stereopsis. A comparison between projected- and real-depth thresholds indicated that most of the differences could be accounted for in terms of the change in stereoscopic sensitivity associated with differing errors in the equidistance judgements. The method of disparity display described allows for the direct observation of those attributes of random-dot stereopsis known as global stereopsis and local stereopsis and requires caution in comparison of stereopsis thresholds using these different perceptual criteria.
D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D014787:Vision Tests / Q000295:instrumentation / Q000379:methods*