Definitions for dark adaptation
Random House Webster's College Dictionary
the reflex adjustment of the eye to dim light or darkness, consisting of a dilation of the pupil, an increase in the number of functioning rods, and a decrease in the number of functioning cones.
Origin of dark adaptation:
the process of adjusting the eyes to low levels of illumination; cones adapt first; rods continue to adapt for up to four hours
U.S. National Library of Medicine
Adjustment of the eyes under conditions of low light. The sensitivity of the eye to light is increased during dark adaptation.
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