BINOCULAR VISION--NORMAL AND ABNORMAL

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Abstract
The basic problems of retinal binocular stereopsis are centered around the conceptions of correspondence and disparity. Hering1unquestionably laid the foundations for a comprehensive understanding of these conceptions. The weakness of his theories lies in their static, geometric character: According to Hering, whether two points are corresponding or disparate depends on whether the distances from the foveas are the same or different; furthermore, a strict relationship exists between the amount of depth and disparity. This article attempts to demonstrate that a dynamic rather than a static, geometric conception of stereopsis is correct. It seems appropriate to start the analysis with a simple dynamic phenomenon, well known but rarely if ever utilized for the interpretation of stereoscopic processes. Figure 1 presents two stereoscopic drawings, one for the left and the other for the right eye. The two scales seen through the stereoscope appear as a single scale united in the

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