Human Vision and the Spectrum

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Abstract
Measurements in the periphery of the aphakic eye come as close to the intrinsic sensitivities of rods and cones as it is possible to approach in vivo. Only minor pigments of the cornea, ocular humors and extramacular retina remain to screen the receptors. Rod and cone sensitivities are intimately related to the absorption spectra of their pigments, rhodopsin and iodopsin. The rhodopsin spectrum is fairly well known. The over-all transmission of the human eye has also been measured. With these data one can compute a spectral sensitivity function for normal rod vision which agrees with that observed. The absorption spectrum of iodopsin and of some of the ocular structures through which light passes before striking the receptors is uncertain. Such data would allow synthesis of the spectral sensitivity functions of rod and cone vision, centrally and peripherally, and in the normal and aphakic eye.

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