noun Ophthalmology.

1675–85; < Late Latin nyctalōpia < Greek nykt- nyct- + al(aós) blind + -ōpia -opia

nyctalopic [nik-tl-op-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nyctalopia (ˌnɪktəˈləʊpɪə)
Compare hemeralopia Nontechnical name: night blindness inability to see normally in dim light
[C17: via Late Latin from Greek nuktálōps, from nux night + alaos blind + ōps eye]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

nyctalopia nyc·ta·lo·pi·a (nĭk'tə-lō'pē-ə)
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
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