(physiology) Vision that is due to the activity of the rods of the retina only; it is the type of vision that occurs at very low levels of illumination, and it can detect differences of brightness but not of hue. Also known as night vision.
Scotopic vision
Sci-Tech Dictionary:
scotopic vision |
(skə′täp·ik ′vizh·ən)
5min Related Video:
Scotopic vision |
US Military Dictionary:
night vision |
The faculty of seeing in very low light, especially after the eyes have become adapted.
night-vision denoting devices that enhance nighttime vision: night-vision goggles.
See the Introduction, Abbreviations and Pronunciation for further details.
Medical Dictionary:
scotopic vision |
n.
Vision that occurs when the eye is dark-adapted. Also called scotopia.
WordNet:
scotopic vision |
Note: click on a word meaning below to see its connections and related words.
The noun has one meaning:
Meaning #1:
the ability to see in reduced illumination (as in moonlight)
Synonyms: night vision, night-sight, twilight vision
Wikipedia:
Scotopic vision |
Scotopic vision is the vision of the eye under low light conditions. The term comes from Greek skotos meaning darkness and -opia meaning a condition of sight.[1] In the human eye cone cells are nonfunctional in low light - scotopic vision is produced exclusively through rod cells so there is no color perception. Scotopic vision occurs at luminance levels of 10-2 to 10-6 cd/m². In other species, such as the Elephant Hawk-moth (Deilephila elpenor), advanced color discrimination is displayed. [2]
Mesopic vision occurs in intermediate lighting conditions (luminance level 10-2 to 1 cd/m²) and is effectively a combination of scotopic and photopic vision. This however gives inaccurate visual acuity and colour discrimination.
In normal light (luminance level 1 to 106 cd/m²), the vision of cone cells dominates and is photopic vision. There is good visual acuity (VA) and colour discrimination.
In scientific literature, one occasionally encounters the term scotopic lux which corresponds to photopic lux, but uses instead the scotopic visibility weighting function.[3]
See also
References
- ^ scotopia at dictionary.com
- ^ Scotopic colour vision in nocturnal hawkmoths
- ^ Photobiology: The Science of Light and Life (2002), Lars Olof Björn, p.43, ISBN 1402008422
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 | Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| US Military Dictionary. The Oxford Essential Dictionary of the U.S. Military. Copyright © 2001, 2002 by Oxford University Press, Inc. All rights reserved. Read more |
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| Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Read more |
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