PARTIAL COLOR LOSS IN HEMIACHROMATOPSIA

Hemiachromatopsia, the acquired impairment of hemifield color vision, usually results from an infarction to the contralateral occipitotempor al cortex. Generally, patients with hemiachromatopsia have a homolater al superior quadrantanopsia and are unaware of their color deficit. Th e literature on cerebral color blindness dwells largely upon patients with bilateral deficits (central achromatopsia), presumably because th ese individuals have greater insight into their color processing defic it. Here, the authors describe a patient with a partial loss of color vision in one hemifield. Initially, the colors red and yellow were app reciated as desaturated, while other hues were undetectable.