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Related to light adaptation: dark adaptation
The process, chiefly involving constriction of the pupil, by which the eye adapts to an increase in illumination.
light′-a·dapt′ed (-ə-dăp′tĭd) adj.
the reflex adjustment of the eye to bright light, consisting of a constriction of the pupil, an increase in the number of functioning cones, and a decrease in the number of functioning rods.