dark adaptation

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dark adaptation

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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

dark′ adapta`tion

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.
dark′-a•dapt`ed, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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The animals were allowed to dark-adapt for at least one hour prior to an experiment.
Give your eyes time to dark-adapt and then lie back and watch the stars.
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).
The wavelength of maximum sensitivity (480 or 490 nm) determined for a given dark-adapted animal in the spectral sensitivity experiment was used to determine that specimen's irradiance sensitivity.
But because dark-adapted rods have nearly the same sensitivity to red light as our L-cones, red light that is bright enough to read by is sufficient to excite our rod cells somewhat.
The present findings may have a direct bearing on the results of recent studies showing that 100-500 [micro]M histidine significantly enhances the electroretinographic b-wave responses in the dark-adapted retinas of both state and zebrafish (13, 14, 15).
astreoides by means of PAM fluorometry revealed that the dark-adapted (maximal) quantum yield of photo-system (PS) II (calculated as [F.sub.v]/[F.sub.m] which is defined in Fig.
After finishing the walk, visitors can continue stargazing here with their dark-adapted eyes, perhaps sitting at a bench that locals call the Stars' Rest.
That means selecting an eyepiece that simultaneously gives the widest field of view at the highest magnification while matching the maximum size of your eye's fully dark-adapted pupil.
Figure 1C shows representative dark-adapted ERG responses that were obtained from an eyecup preparation (Fig.
The peak electrophysiological spectral sensitivity of dark-adapted eyes was centered at about 500 n m.