Nyctanopia
Impaired vision in dim light and in the dark, due to impaired function of the rods in the retina. Night blindness is a classic finding from deficiency of vitamin A. Nyctanopia is also known as day sight, nocturnal amblyopia, nyctalopia.
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SYN: nyctalopia. [nyct- + G. an- priv. + opsis, sight]

Medical dictionary. 2011.

Look at other dictionaries:

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

  • Amblyopia, nocturnal — Amblyopia refers to blindness so nocturnal amblyopia is, literally, night blindness. Listed in medical dictionaries under Nyctalopia from the Greek nyct (night) + aloas (obscure or blind) + opsis (vision), the condition involves impaired vision… …   Medical dictionary

  • Blindness, night — 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

  • Day sight — Night blindness. Listed in medical dictionaries under “Nyctalopia” from the Greek “nyct’ (night) + “aloas” (obscure or blind) + “opsis” (vision), the condition involves impaired vision in dim light and in the dark (but normal sight in bright… …   Medical dictionary

  • Fear of the dark — Pathological fear of the dark, an abnormal and persistent dread of the dark. Sufferers experience undue anxiety even though they may rationally realize that the dark does not pose a threat commensurate with their fear. Fear of the dark is termed… …   Medical 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

  • Nocturnal amblyopia — Amblyopia refers to blindness so nocturnal amblyopia is, literally, night blindness. Listed in medical dictionaries under Nyctalopia from the Greek nyct (night) + aloas (obscure or blind) + opsis (vision), the condition involves impaired vision… …   Medical dictionary

  • Nyctophobia — Pathological fear of the dark, an abnormal and persistent dread of the dark. Sufferers experience anxiety even though they may rationally realize that the dark does not pose a threat commensurate with their fear. Formed from the Greek nyx (night) …   Medical dictionary

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