HEMIACHROMATOPSIA OF UNILATERAL OCCIPITOTEMPORAL INFARCTS

Two patients developed unilateral occipitotemporal infarcts that produ ced inferior quadrantic achromatopsia and an accompanying superior qua drantanopia. Magnetic resonance imaging and single-photon emission com puted tomographic studies of both patients supported the current view that color vision is encoded in the lingual and fusiform gyri. Althoug h the quadrantic defect in color processing was profound, neither pati ent was aware of it. Simple bedside testing of patients with superior quadrantanopia may disclose an unrecognized quadrantic achromatopsia.