NYCTALOPIA

‖Nyc′ta‐lo″pi‐a (nĭk′tȧ‐lō″pĭ‐ȧ), n. [[L. nyctalopia, fr. nyctalops a nyctalops, Gr. νυκτάλωψ. Gr. νυκτάλωψ meant, a person affected either with day blindness or with night blindness, and in the former case was derived fr. νύξ, νυκτόσ, night + ὤψ, ωπὄσ, the eye; in the latter, fr. νύξ + αλαὄσ blind + ὤψ.]] (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. ☞ Some writers (as Quain) use the word in the opposite sense, night blindness. See Hemeralopia.