PRACTICE OF DARK ADAPTATION

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Abstract
The purpose of this paper is to review the subject of dark adaptation and the technic for its study. A brief sketch of the common instruments used to record dark adaptation is given, with particular reference to the method by which the quality of the light is retained throughout its entire varying range of intensity. The quantitative instrument I now use in my studies is described. Dark adaptation, as the term implies, is the ability which the eye has to adapt itself to darkness. For example, if one enters a darkened cinema theater on a sunny day, it is impossible at first to see any seats, but after a specified number of minutes objects are somewhat clearer. As time goes on, improvement in vision is noted, until the sight becomes as distinct as if the theater were illuminated. This physiologic function of the normal human being is one

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