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nyctalopia n. 夜盲癥 夜盲症 nyctalopia n 1: inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder [ synonym: { nyctalopia}, { night blindness}, { moon blindness}] Nyctalopia \ Nyc` ta* lo" pi* a\ ( n[ i^] k` t[. a]* l[= o]" p[ i^]*[. a]), n. [ L. nyctalopia, fr. nyctalops a nyctalops, Gr. nykta` lwps. Gr. nykta` lwps meant, a person affected either with day blindness or with night blindness, and in the former case was derived fr. ny` x, nykto` s, night ' w` ps, ' wpo` s, the eye; in the latter, fr. ny` x ' alao` s blind ' w` ps.] ( Med.) ( a) A disease of the eye, in consequence of which the patient can see well in a faint light or at twilight, but is unable to see during the day or in a strong light; day blindness. ( b) See { Moonblink}. [ 1913 Webster] Note: Some writers ( as Quain) use the word in the opposite sense, night blindness. See { Hemeralopia}. [ 1913 Webster]
Moonblink \ Moon" blink`\, n. A temporary blindness, or impairment of sight, said to be caused by sleeping in the moonlight; -- sometimes called { nyctalopia}. [ 1913 Webster]
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