BINOCULAR MECHANISMS IN SMALL-ANGLE STRABISMUS* BY

THE purpose of treatment of all patients with strabismus is to reduce the angle of deviation to the smallest possible value and to develop the co-opera-tion between the eyes to the highest possible degree. Normal binocular use of the eyes may be achieved in patients with fully accommodative squints of late onset and relatively short duration, but this is not always the case even in patients who show strong fusion and stereopsis on the major amblyoscope. A certain number of such patients have a definite slight deviation on cover test at all distances; others have a manifest deviation for one distance only, arousing the suspicion that binocular vision may not be perfect even at those distances at which the cover test reveals no deviation; the subsequent history may demonstrate a tendency for the strabismus to recur; and in others the depth perception may be surprisingly poor (Naylor, Shannon, and Stanworth, 1956). One possible obstacle to perfect binocular vision in such patients is abnor-mal retinal correspondence with a very small angle of anomaly; this may b