Impairment of flicker discrimination in brain‐damaged patients

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Abstract
The flicker-fusion visual fields of 13 operated and 13 nonoperated braindamaged patients are compared with those of 26 patients with no central nervous system disorder. Flicker is produced by an electronically controlled glow modulator tube, mounted on an adaptation of a standard perimeter. Twenty-eight descending trial threshold determinations are made in each eye, arranged on the 10, 20, and 30[degree] circles. The brain-damaged group has lower flicker-fusion thresholds at every point, including central monocular and binocular positions, and significantly larger discrepancies in thresholds in nonhomonymous fields. Both operated and nonoperated brain-damaged subjects manifest the same degree of visual impairment.

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