Abstract

Based upon differences in velocity of changes in electrical sensitivity of the eye after exposure to a flash of light, it is possible to isolate a rod-process from a mixture of cone- and rod-processes. By means of this method rod-responses to spectral lights were measured at 20° from the fovea as a function of wavelengths. The spectral distribution of rod-responses determined in this manner is found in satisfactory agreement with the scotopic visibility curve.

Rod-responses to a flash of weak white light were measured at various parts of the retina. The spatial distribution of rod-responses so obtained is found to show close resemblance to the density distribution of rods in the retina, although the maximum of the former is displaced farther in the periphery beyond the maximum of the density as the intensity of the flash is reduced.

© 1951 Optical Society of America

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