LOCALIZING VALUE OF INCONGRUITY IN DEFECTS IN THE VISUAL FIELDS

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Abstract
Asymmetry or incongruity of incomplete homonymous hemianopic defects in the visual fields is a constant finding with lesions of the anterior portion of the geniculocalcarine pathway. It becomes less and less evident the farther back the visual pathway is interrupted, until in the defects in the visual fields, found in association with lesions of the occipital lobe, the degree of symmetry is very striking. The value of perimetry in the lateral localization of tumors of the brain has long been known. The study of this phenomenon of varying incongruity, both in the literature and in the following case reports, has shown it to be of definite value in localizing cerebral lesions anteroposteriorly as well as laterally. If one carefully examines the literature relative to this clinical entity, analyzing the defects in the visual fields described in the various articles and collecting those charts of the visual fields illustrative of proved

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