Abstract

This report deals with the conditions which modify spectral sensitivity of the photopic retinal action potential (ERG). The parameters of visual angle (retinal area) and level of response have received particular attention. It was found that when responses are small, their relative spectral sensitivity is nearly independent of stimulus diameter. More sizeable responses have a greater relative sensitivity to red light. With conditions of large stimulus area, electro-retinal sensitivity shows a close agreement with existing psychophysical determinations of luminosity. The results are considered in relation to earlier studies of the ERG and the stray light hypothesis.

© 1955 Optical Society of America

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