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.
The numerical value of dark adaptation in Chaldean Numerology is: 9
The numerical value of dark adaptation in Pythagorean Numerology is: 9
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"dark adaptation." Definitions.net. STANDS4 LLC, 2017. Web. 29 May 2017. <http://www.definitions.net/definition/dark adaptation>.