Stereoscopic distortion results when retinal image size differences are induced by aniseikonic lenses. In the present study an attempt was made to determine with what frequency and magnitude retinal image size differences occur ‘naturally,’ on the basis of structural differences between the two eyes. An analysis of data from the opthalmologic literature was carried out. The results suggested that substantial retinal image-size-differences occur in the population studied. An adaptation hypothesis was briefly examined in an effort to account for the fact that instances of stereoscopic distortion are relatively infrequent.
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