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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
[F.sub.0]: minimal fluorescence in dark-adapted state; Fm: maximum fluorescence in dark-adapted state; (F'm-F')/F'm: PSII operating efficiency; Fv/Fm: maximum quantum yield; [R.sub.fd]: fluorescence decline ratio in steady-state; NPQ: non-photochemical quenching during light adaptation.
The ERG b-wave amplitudes was recorded under dark-adapted control (n = 6) and NiONP treatment conditions and compared.
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).
E curve (dimensionless) [F.sub.o], [F.sub.m] Minimum and maximum fluorescence emitted by a dark-adapted sample (arbitrary units) [F.sub.s], [F'.sub.m] Steady-state and maximum fluorescence emitted by a light-adapted sample (arbitrary units) [F.sub.v]/[F.sub.m] Maximum quantum yield of PSII of a dark-adapted sample (dimensionless) LC Light curves: steady-state rETR vs.
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.
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.e., a leaf that has been in the dark for a period of time long enough so that all the components of the photosynthetic electron transport chain are in the oxidized state (2).
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., 2005).
Following L&Z supplementation, a significant MPOD increase was accompanied by improved pattern electroretiongram amplitude and increased dark-adapted cone sensitivity.
For this reason it may be a good idea to keep one eye closed while you turn on the light and have it remain dark-adapted.
Thus it is that a romantic, page-turning supernatural/psychological mystery like Sarah Waters' Affinity gets pride of place in "Literature," while brilliant fictions like A Dark-Adapted Eye by Barbara Vine (a pseudonym of Ruth Rendell) have to slug it out next to genre retreads in the "Mystery/Thriller" section.