Abstract
An experimental as well as a theoretical analysis of the photochromatic interval as a function of dark adaptation has been undertaken. It is commonly assumed that the variation of the photochromatic interval with dark adaptation bears the following simple relation to the two-step dark adaptation curve. During the first step of dark adaptation the specific threshold coincides with the absolute threshold, and the photochromatic interval should not appear until this period of dark adaptation is passed. During further stay in the dark, the specific threshold remains unchanged from its value at the break in the dark adaptation curve. The intensity area covered by the second step of the dark adaptation curve should, therefore, be a representation of the changing value of the photochromatic interval as dark adaptation proceeds beyond the first step.
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