Experiment has shown that when a difference in the sizes of the images of the two eyes is introduced either in the horizontal or in the vertical meridian (by placing a meridional size lens, with axis vertical or horizontal before one eye) all objects in the binocular field, except that at the fixation point, appear displaced in depth from their original positions. In general, the displacements are such that the whole binocular visual field appears as if it had undergone at the fixation point a certain amount of rotation about a vertical axis. This change is most apparent when the field is free from perspective clues.
A difference in the sizes of the images introduced in the horizontal meridian changes the disparities of the retinal images of all objects in the binocular visual field in the meridian of stereoscopic depth perception. Hence, in accordance with geometric optics, false stereoscopic depth
OGLE KN. INDUCED SIZE EFFECT: III. A STUDY OF THE PHENOMENON AS INFLUENCED BY HORIZONTAL DISPARITY OF THE FUSION CONTOURS. Arch Ophthalmol. 1939;22(4):613–635. doi:10.1001/archopht.1939.00860100097009
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