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December 1956

Stereopsis and Unequal Luminosities of the Images in the Two Eyes

Author Affiliations

Rochester, Minn.
Section of Biophysics and Biophysical Research, Mayo Clinic and Mayo Foundation. The Mayo Foundation is a part of the Graduate School of the University of Minnesota.

AMA Arch Ophthalmol. 1956;56(6):878-895. doi:10.1001/archopht.1956.00930040890011

Introduction  The extent to which a difference in the luminosities of the images in the two eyes can affect binocular vision and, in particular, stereoscopic depth perception has been an intriguing problem to research workers in vision for a long time.The most striking effect, of course, is the Pulfrich stereophenomenon, in which the stimulus object is in motion relative to a fixed background. The bob of a swinging pendulum appears to move in a more or less elliptical path when the image of one eye is darkened by a filter. This phenomenon is usually explained by a decreased reaction time in the physiologic processes of one eye associated with the decreased intensity of its image. The second effect, which may be called "irradiation stereoscopy,"1 was first discovered by Münster2 in 1941 and later independently by Cibis and Haber.* In this effect, two separated squares of white cardboard,