night blindness

night blindness
night blindness
imperfect vision in the dark or in dim light: a symptom of vitamin A deficiency

English World dictionary. . 2014.

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  • Night blindness — Night Night (n[imac]t), n. [OE. night, niht, AS. neaht, niht; akin to D. nacht, OS. & OHG. naht, G. nacht, Icel. n[=o]tt, Sw. natt, Dan. nat, Goth. nahts, Lith. naktis, Russ. noche, W. nos, Ir. nochd, L. nox, noctis, Gr. ny x, nykto s, Skr. nakta …   The Collaborative International Dictionary of English

  • night-blindness — nightˈ blindness noun Inability to see in a dim light, nyctalopia • • • Main Entry: ↑night …   Useful english dictionary

  • Night blindness — Impaired vision in dim light and in the dark, due to impaired function of specific vision cells (namely, the rods) in the retina. The ability of our eyes to quickly view objects as they shift from light to dark areas and the ability to see in dim …   Medical dictionary

  • night blindness — nightblind, adj. Ophthalm. a condition of the eyes in which vision is normal in daylight but abnormally poor at night or in a dim light; nyctalopia. [1745 55] * * * ▪ physiology also called  nyctalopia         failure of the eye to adapt promptly …   Universalium

  • night blindness — the inability to see in dim light or at night. It is due to a disorder of the cells in the retina that are responsible for vision in dim light (see rod), and can result from dietary deficiency of vitamin A. If the vitamin deficiency is allowed to …   The new mediacal dictionary

  • night blindness — night′ blind ness n. oph a condition in which vision is normal in daylight but abnormally poor in dim light • Etymology: 1745–55 night′blind , adj …   From formal English to slang

  • night blindness — noun The optic condition nyctalopia, the inability to see clearly in faint light, as at night Syn: moon blindness …   Wiktionary

  • night blindness — Synonyms and related words: Lombardy leprosy, anemia, ariboflavinosis, beriberi, cachexia, chlorosis, day blindness, deficiency anemia, dermatitis, goiter, greensickness, hemeralopia, keratomalacia, kwashiorkor, maidism, malnutrition, moon… …   Moby Thesaurus

  • night blindness — noun inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder • Syn: ↑nyctalopia, ↑moon blindness • Hypernyms: ↑visual impairment, ↑visual defect, ↑vision defect, ↑visual disorder, ↑ …   Useful english dictionary

  • night blindness — noun Date: 1754 reduced visual capacity in faint light (as at night) • night blind adjective …   New Collegiate Dictionary

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