Effects on stereopsis of monocular versus binocular degradaton of image contrast

Stereoacuity on a number of common clinical tests was reduced twice as much by degradation of the contrast of one eye's image as by an equal reduction of contrast of the image in both eyes. This finding, in conjunction with related clinical and animal study results, emphasizes the need for early detection of conditions causing interocular contrast asymmetry in infants and children, if normal binocular visual development is to be achieved. It also raises question about the effect of monocular occlusion therapy on the binocular potential of amblyopia patients.