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 ?
Fundus photographs after 8 hours of patching revealed Mizou Nakamura phenomenon which is characterized by loss of the golden sheen and tapetal reflex after prolonged dark adaptation (fig-1) OCT (Topcon 3D OCT-1 Maestro) showed normal central foveal thickness but reduced retinal thickness in parafoveal region (fig-2).
Dynamically tunable solid-state lighting technology is also ideal for mitigating issues associated with dark adaptation.
The point on the dark adaptation curve when the sensitivity of the rods initially exceeds that of the cones is known as the rod-cone break.
Affected individuals first experience defective dark adaptation or nyctalopia (night blindness), followed by reduction of the peripheral visual field (known as tunnel vision) and, sometimes, loss of central vision late in the course of the disease.
All the tricks of deep sky observing at the limit will be necessary, such as full dark adaptation, averted vision and a pristine dark sky site, along with a telescope in the half-metre class.
The dark adaptation sees the detective stranded on board the train while it is caught in a snowdrift in Eastern Europe.
A FAST-paced, deliciously dark adaptation of The Strange Case of Dr Jekyll & Mr Hyde is at Wrexham's Glyndwer University this month.
The European Arts Company, an international touring theatre troupe based in Kent, presents a fast-paced, dark adaptation of famous tale on Tuesday, March 30, at 7.