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 in dim light and in the dark due to impaired function of specific vision cells (namely, the rods) in the retina. Night blindness, a classic finding in vitamin A defciiency, was discovered by the English physician William Heberden (1710-1801). (Heberden also described other medical disorders of importance including angina (chest pain that is often severe and crushing, due to an inadequate supply of oxygen to the heart muscle) and Heberden’s nodes, bumps around the small joints due to osteoarthritis.) Night blindness (nyctalopia) is also called day sight and nyctanopia.

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abnormal dimness of vision at night.

Medical dictionary. 2011.

Look at other dictionaries:

  • 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

  • Amblyopia — Impaired vision in an eye due to a disorder of the brain cells that control the vision in that eye, not usually due to a problem with the eye itself. Amblyopia is caused by lack of use of an eye when the brain favors the other eye. The eye is… …   Medical dictionary

  • 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

  • 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

  • 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

  • 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. * * * SYN …   Medical dictionary

  • Sight, day — 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

  • Myopia — For other uses, see Myopia (disambiguation). Myopia Classification and external resources ICD 10 H …   Wikipedia

  • Dichromacy — Classification and external resources ICD 10 H53.5 ICD 9 368.5 O …   Wikipedia

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