Early in the research in aniseikonia, it was recognized that differences in the size and shape of the ocular images of the two eyes have an important effect on correct binocular (stereoscopic) spatial localization. This localization takes place over the entire binocular visual field and is not restricted to the discrimination of differences in depth in the central field of vision. Many of the basic facts concerning the relationship between anomalous binocular spatial localization and the difference in size and shape of the ocular images were brought out in the early studies on the horopter.1 It was shown that a rotation and a distortion of the longitudinal horopter occur when the relative sizes of the images from the two eyes are changed by "size" lenses placed before the eyes. Corresponding disturbances in binocular spatial localization were shown to take place with less simplified objects, as in the studies on
OGLE KN. ASSOCIATION BETWEEN ANISEIKONIA AND ANOMALOUS BINOCULAR SPACE PERCEPTION. Arch Ophthalmol. 1943;30(1):54–64. doi:10.1001/archopht.1943.00880190072006
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