Abstract
In three-dimensional display systems, binocular disparities must be limited within a certain fusional area, called as “Panum's fusional area”, otherwise too large disparity could cause double view or serious eye tiresome. In this study, a three-dimensional display device was employed with a constant stimuli method to measure the disparity limits of the Panum's fusional area in sixteen different directions from 0 degree to 360 degrees by a step of 22.5 degrees in the retinal fovea. The following results were obtained: (1) the horizontal disparity limit of binocular fusional area is about 32-40min of arc and the vertical limit is about 19.2-25.6min of arc. (2) The disparity limits of binocular fusional area are approximatively symmetrical about horizontal meridian. (3) The disparity limits are not symmetrical about vertical meridian, and the nasalward disparity limits are obviously larger than the temporalward disparity limits. (4) In the nasal side of retina, the disparity limits decrease in a monotonic fashion and in the temporal side, however, the disparity limits have no obvious difference.
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