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[hem-er-uh-loh-pee-uh] /ˌhɛm ər əˈloʊ pi ə/
noun, Ophthalmology.
a condition of the eyes in which sight is normal in the night or in a dim light but is abnormally poor or wholly absent in the day or in a bright light.
Also called day blindness.
Origin of hemeralopia
1700-10; < New Latin < Greek hēmeralōp- (stem of hēmerálōps having such a condition (hēmer(a) day +al(aós) blind + -ōps having such an appearance) + -ia -ia; cf. -opia
Related forms
[hem-er-uh-lop-ik] /ˌhɛm ər əˈlɒp ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for hemeralopia


inability to see clearly in bright light Nontechnical name day blindness Compare nyctalopia
Derived Forms
hemeralopic (ˌhɛmərəˈlɒpɪk) adjective
Word Origin
C18: New Latin, from Greek hēmeralōps, from hēmera day + 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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hemeralopia in Medicine

hemeralopia hem·er·a·lo·pi·a (hěm'ər-ə-lō'pē-ə)
A visual defect marked by the inability to see as clearly in bright light as in dim light. Also called day blindness.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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