Definitions for: Nyctalopia


[n] inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder



Webster (1913) Definition: Nyc`ta*lo"pi*a, n. [L. nyctalopia, fr. nyctalops a
nyctalops, Gr. ?. Gr. ? meant, a person affected either with
day blindness or with night blindness, and in the former case
was derived fr. ?, ?, night + ?, ?, the eye; in the latter,
fr. ? + ? blind + ?.] (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.

Note: Some writers (as Quain) use the word in the opposite
sense, night blindness. See Hemeralopia.

Synonyms: moon blindness, night blindness

See Also: avitaminosis, hypovitaminosis, vision defect, visual defect, visual disorder, visual impairment

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