dark adaptation

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dark adaptation

n.
The physical and chemical adjustments of the eye, including dilation of the pupil and increased activity of rods in the retina, that make vision possible in relative darkness.

dark′-a·dapt′ v.
dark′-a·dapt′ed (-ə-dăp′tĭd) adj.

dark′ adapta`tion


n.
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.
[1905–10]
dark′-a•dapt`ed, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
adaptation - (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light)
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References in periodicals archive ?
Interestingly, that's the claimed magnitude for the faintest stars seen with the naked eye during a total eclipse--provided sunglasses or an eye-patch were worn before totality in order to dark-adapt.
The general procedure was to dark-adapt larvae for at least 1 h and place a group of about 10 larvae in an acrylic cuvette (9-cm square).
Give your eyes time to dark-adapt and then lie back and watch the stars.