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Abstract
The visual-evoked response (VER) has been recorded using a small fashing light with several sizes of surround. The critical size surround producing maximum inhibition has been determined in the normal and amblyopic eye of an amblyopic subject. The critical size surround is larger in the amblyopic eye. The inhibition has been found to occur peripheral to the primary visual cortex. These results imply that at least part of the defect in functional amblyopia is located peripheral to the primary visual cortex