Abstract
The usual explanation of the disparity-diplopia relationship in terms of retinal fusional areas (Panum's fusional areas) is discussed. Measurements were made of the size of Panum's areas at the fovea, using a method of constant stimuli with flash presentation of the test target to prevent fusional eye movements from influencing the results. Under these conditions little inter- or intra- individual variation was found. In contrast to previous studies, little meridional difference was observed in the amount of disparity necessary to elicit diplopia. Various factors are suggested to explain the relatively large amount of disparity that must be introduced between the two ocular images before diplopia is perceived.
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