dark adaptation

noun Ophthalmology.

the reflex adaptation of the eye to dim light, consisting of a dilatation of the pupil and an increase in the number of functioning rods accompanied by a decrease in the number of functioning cones (opposed to light adaptation).

Origin of dark adaptation

First recorded in 1905–10
Related formsdark-a·dapt·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for dark adaptation

dark adaptation



The adjustment of the eye under reduced illumination, in which sensitivity to light is greatly increased.scotopic adaptation
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.