Abstract

The threshold of stereopsis (mean deviation in sec of arc) of three observers was measured at 2° intervals from 8° right to 8° left in the horizontal meridian of the binocular field. A simple two-point target, along with a binocular fixation point, was presented by use of a mirror haploscope. Disparity was introduced by varying the separation of the two peripheral points in one eye. Judgments of the relative depth of the two binocular peripheral points, were based on these disparity cues. The data show a decrease of stereoscopic acuity as a function of horizontal offset. There is a slight discontinuity in the curve, near 4° to 6°, which may correspond to a rod–cone density change.

© 1969 Optical Society of America

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