[Evoked potentials to perception of photic stimuli of different intensity in normal subjects and optic nerve atrophy]

In 30 subjects with normal vision an increase in stimulus brightness (8 gradations) led to reduction in pick-latencies (PL) of II-VII waves and to an increase in their amplitudes (A), maximal in the IV positive wave with PL amounting to 102-109 msec. Atrophy of optical nerves produced an impairment of power processing of the signal and its temporal characteristics, a decline of A III, IV waves (especially pronounced in IV) and a tendency to an increase in A V and VI waves. Informational significance of PL waves and characteristics of information processing with impaired vision are discussed.