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night blindness

noun, Ophthalmology
1.
a condition of the eyes in which vision is normal in daylight but abnormally poor at night or in a dim light; nyctalopia.
Origin
1745-1755
1745-55
Related forms
nightblind, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nightblind

night blindness

noun
1.
(pathol) a nontechnical term for nyctalopia
Derived Forms
nightblind, adjective
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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nightblind in Medicine

night blindness n.
See nyctalopia.

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 nightblind

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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