Abstract

Investigators have used the slope of the a wave of the electroretinogram (ERG) as a measure of photoreceptor-response magnitude, but an examination of the factors affecting this response attribute is lacking. Previous evidence demonstrates that the cones’ temporal sensitivity varies with the state of adaptation, which makes the cone a -wave slope a complex measure of both amplitude and adaptation-level-dependent temporal sensitivity. Here I consider the influence of the rod photoreceptor temporal sensitivity on the slope of the a wave. The present study of the rod local ERG of the primate indicates that the rods are temporally invariant, suggesting that the rod a-wave slope may be used as a relative measure of the amplitude of the rods’ late-receptor potential.

© 1982 Optical Society of America

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