dark adaptation

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dark adaptation

The process by which the iris and the retina of the eye adjust to allow maximum vision in dim illumination following exposure of the eye to a relatively brighter illumination. In darkness, vision becomes more sensitive to light, provided a person has not been exposed to bright light for some time. Although exposure to total darkness for at least 30 minutes is required for complete dark adaptation, a pilot can achieve a moderate degree within 20 minutes under dim red cockpit lighting. Dark adaptation is impaired by exposure to cabin pressure altitudes above 5000 ft, carbon monoxide inhaled in smoking and from exhaust fumes, deficiency of vitamin A in the diet, and prolonged exposure to bright sunlight.
References in periodicals archive ?
Once your eyes are dark-adapted under clear, moonless skies, look through your eyeglasses at a familiar star field.
The dark-adapted naked eye has an aperture about 7 mm in diameter (the pupil), and from a dark observing site stars down to about magnitude +6.
NPQ as a non-photochemical- quenching parameter relating to the dark-adapted state, whatever, is associated with a change in the efficiency of heat dissipation (Li and Ong, 1997).
m] Minimum and maximum fluorescence emitted by a dark-adapted sample (arbitrary units) [F.
Over a 14-hour span on September 23, centred on 11:50UT, Uranus draws to within one arcminute of 44 Piscium--an angular separation less than the dark-adapted eye's resolution limit.
From girl sleuths to serial killers, topics include gender-bending in Barbara Neely's Blanche White series, deconstructing the private dick in Sue Grafton's alphabet series, and the role of the narrator in Barbara Vine's A Dark-Adapted Eye.
EDGAR AWARD A DARK-ADAPTED EYE | BARBARA VINE (PSEUDONYM FOR RUTH RENDELL)
The experiments were conducted on a dark-adapted partial preparation that included the eye ball, optical nerve, and cerebral ganglion.
Then, to our dark-adapted eyes, we would see them glow in a variety of colors.
Let us first discuss what happens when one illuminates a dark-adapted leaf, i.
In particular, their practical utility is illustrated by analysis of gold particles labelling the phosphoprotein, phosducin, in subcellular domains of rod photoreceptors in the retinas of light- and dark-adapted groups of rats (Chen et al.