The ability of the human eye to adjust seeing dim objects in the dark.
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Heightened sensitivity to light when the eye is subjected to darkness for an extended period. Chemical changes take place in the retina, mostly in the first 20 minutes in darkness but continuing for up to two hours, that greatly improve the observer`s ability to see faint objects. However, they can ...
The adjustment of the eye occurring under reduced illumination in which the sensitivity to light is greatly increased or the light threshold is greatly reduced. ... Dark adaptation is slower than light adaptation. During dark adaptation rhodopsin is built up in the retinal rods. ... (12 Dec 1998) ... 
adaptation of the eye to vision in the dark or in reduced illumination.
The ability of the human eye to adjust itself to low light levels.
Type: Term Definitions: 1. the visual adjustment occurring under reduced illumination in which the retinal sensitivity to light increases. Synonyms: scotopic adaptation
The eyes transition to night vision, in order to see faint objects. Dark adaptation is rapid during the first 5 or 10 minutes after you leave a well-lit room, but full adaptation requires at least a half hour and it can be ruined by a momentary glance at a bright light.
[n] - the process of adjusting the eyes to low levels of illumination
noun the process of adjusting the eyes to low levels of illumination; cones adapt first; rods continue to adapt for up to four hours
The gradual improvement of the eyes' sensitivity after a shift in illumination from light to near darkness.
The process by which receptor cells become more sensitive to light.