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nyctalopia

[nik-tl-oh-pee-uh] /ˌnɪk tlˈoʊ pi ə/
noun, Ophthalmology
Origin
1675-1685
1675-85; < Late Latin nyctalōpia < Greek nykt- nyct- + al(aós) blind + -ōpia -opia
Related forms
nyctalopic
[nik-tl-op-ik] /ˌnɪk tlˈɒp ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nyctalopia

nyctalopia

/ˌnɪktəˈləʊpɪə/
noun
1.
inability to see normally in dim light Nontechnical name night blindness Compare hemeralopia
Word Origin
C17: via Late Latin from Greek nuktálōps, from nux night + alaos blind + ōps eye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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nyctalopia in Medicine

nyctalopia nyc·ta·lo·pi·a (nĭk'tə-lō'pē-ə)
n.
A condition of the eyes in which vision is normal in daylight or other strong light but is abnormally weak or completely lost at night or in dim light and that results from vitamin A deficiency, disease, or hereditary factors. Also called night blindness.


nyc'ta·lo'pic (-lō'pĭk, -lŏp'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for nyctalopia

night blindness

failure of the eye to adapt promptly from light to darkness that is characterized by a reduced ability to see in dim light or at night. It occurs as a symptom of numerous congenital and inherited retinal diseases or as a result of vitamin A deficiency.

Learn more about night blindness with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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