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Effects of Aging on Visual Evoked Responses
Gastone G. Celesia, MD;
Richard F. Daly, MD
Arch Neurol. 1977;34(7):403-407.
Abstract
• The effects of aging on visual evoked responses (VER) and critical frequency of photic driving (CFPD) was studied in 74 volunteers aged 18 to 79. The amplitude of VER to pattern reversal stimulation did not vary with sex or age. The latencies of the first major negative and of the first major positive deflection of the VER were significantly delayed (P <.001) with advancing age. This increase of latency probably reflects a slowing of conduction velocity in the optic nerve or optic pathways or both. CFPD, defined as the highest frequency of photic driving response expressed in flashes per second, showed an inverse correlation, decreasing with age in older subjects. Critical frequency of photic driving is the electrophysiological counterpart of critical flicker fusion, which is known to decrease with advancing age. These data support the concept that aging influences the functions of specialized sensory systems.
Author Affiliations
From the Department of Neurology, St Louis University and the Veterans Administration Hospital (Dr Celesia); and the Department of Neurology, University of Wisconsin Center for Health Sciences, Madison (Dr Daly).
Footnotes
Accepted for publication Feb 23, 1977.
Reprint requests to Department of Neurology, St Louis University, 1221 S Grand Blvd, St Louis, MO 63104 (Dr Celesia).
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