Abstract
When the optical images formed on the two retinas differ in magnification (size), stereoscopically-based spatial distortions are expected to occur due to the ‘spurious’ binocular disparities generated. Whereas lens experiments bear out this expectation, it is not clear that distortion also accompanies the inherent image-size-differences that stem from structural differences between the two eyes. In the present study an attempt was made to compare the actual incidence of stereoscopic distortion in a given population with the expected incidence due to structurally-imposed image-size-differences. Stereoscopic distortion was measured on a space eikonometer. The expected incidence of stereoscopic distortion was computed from data reported in the ophthalmic literature. The results indicated a far lesser degree of distortion present than expected, thus suggesting that image-size-differences are somehow compensated when structurally imposed.
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