During the dark adaptation of the human eye, its visual threshold decreases to a small fraction of its original value in the light. An analysis of the quantitative data describing this adaptation shows that it follows the course of a bimolecular chemical reaction. On the basis of these findings it is suggested that visual reception in dim light is conditioned by a reversible photochemical reaction involving a photosensitive substance and its two products of decomposition. Accordingly, dark adaptation depends on the course of the "dark" reaction during which the two products of decomposition reunite to synthesize the original photosensitive substance.
Article| May 20 1920
THE DARK ADAPTATION OF THE HUMAN EYE
From the Physiological Laboratory, College of Medicine, Creighton University, Omaha.
Received: February 10 1920
Online Issn: 1540-7748
Print Issn: 0022-1295
Copyright, 1920, by The Rockefeller Institute for Medical Research
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Selig Hecht; THE DARK ADAPTATION OF THE HUMAN EYE . J Gen Physiol 20 May 1920; 2 (5): 499–517. doi: https://doi.org/10.1085/jgp.2.5.499
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