Medical term:

nyctalopia


nyctalopia

 [nik″tah-lo´pe-ah]
1. night blindness.
2. sometimes incorrectly used as a synonym for hemeralopia.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

nyc·ta·lo·pi·a

(nik-tă-lō'pē-ă),
Decreased ability to see in reduced illumination. Seen in patients with impaired rod function; often associated with a deficiency of vitamin A.
Synonym(s): day sight, night blindness, nocturnal amblyopia, nyctanopia
[nyct- + G. alaos, obscure, + ōps, eye]
Farlex Partner Medical Dictionary © Farlex 2012

nyctalopia

(nĭk′tə-lō′pē-ə)
n.
See night blindness.
nyc′ta·lo′pic (-lō′pĭk, -lŏp′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

nyc·ta·lo·pi·a

(nik'tă-lō'pē-ă)
Decreased ability to see in reduced illumination. Seen in patients with impaired rod function; often associated with a deficiency of vitamin A.
Synonym(s): night blindness.
[nyct- + G. alaos, obscure, + ōps, eye]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

nyctalopia

Inability to see well in conditions of poor illumination. NIGHT BLINDNESS. From the Greek nyktos, night, alaos, blind and ops, the eye.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

hemeralopia

Term used to mean either night blindness in which there is a partial or total inability to see in the dark associated with a loss of rod function or vitamin A deficiency; or day blindness in which there is reduced vision in daylight while vision is normal in the dark. Syn. nyctalopia (this term is only synonymous with night blindness); night sight (this term is only synonymous with day blindness). See girate atrophy; congenital stationary night blindness; choroideremia; Oguchi's disease; retinitis pigmentosa.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

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