Also known as hemeralopsia and day blindness. The term hemeralopia comes from the Greek words hèmera (day), alaos (blind), and ops (eye). It was introduced into the biomedical literature during the 18th century to denote an ocular condition characterized by a deterioration of vision in bright light, combined with a retention of vision in dim light and in the dark. Hemeralopia is usually classified as an "entoptic phenomenon. Pathophysiologically, it is associated primarily with a loss or impairment of cone photorecep-tor function. Etiologically, it is associated with a variety of conditions ranging from hyperaes-thesia of the retina to cone dystrophy, cone dysfunction syndrome, Stargardt's disease, and retinal ischaemia. A physiological and transient form of hemeralopia may occur following the sudden transition from darkness to bright light. Conceptually, hemeralopia is the logical counterpart of " nyctalopia or night blindness. Phenomenologi-cally, it shows certain similarities with " scieropia and " scierneuropsia, two conditions which are also characterized by a deterioration of vision in bright light. In the continental European literature (notably French, German, and Italian) the term hemeralopia is sometimes used to denote night blindness instead of day blindness. To prevent conceptual confusion due to this paradoxical usage of the term, some authors prefer the term day blindness.
   Ohba, N., Ohba, A. (2006). Nyctalopia and hemeralopia: The current usage trend in the literature. British Journal of Ophthalmology, 90,1548-1549.

Dictionary of Hallucinations. . 2010.


Look at other dictionaries:

  • Hemeralopia — Classification and external resources ICD 10 H53.1 ICD 9 368.6 Hemeralopia (from Greek ημέρα, hemera day ; and αλαός, alaos blindness ) is the inability to see clearly in bright l …   Wikipedia

  • hemeralopía — f. oftalm. Disminución considerable de la agudeza visual durante el crepúsculo causada por una falta de vitamina A y ciertas afecciones de la retina. También se denomina ceguera nocturna. (Ver nictalopía.) Medical Dictionary. 20 …   Diccionario médico

  • Hemeralopia — Hem e*ra*lo pi*a, n. [NL., fr. Gr. ?, the opposite of ?; ? day + ? of ?. See {Nyctalopia}.] (Med.) A disease of the eyes, in consequence of which a person can see clearly or without pain only by daylight or a strong artificial light; day sight.… …   The Collaborative International Dictionary of English

  • hemeralopia — hemeralopia. См. куриная слепота. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • hemeralopia — s. f. [Medicina] Doença caracterizada pela visão normal durante o dia, mas nula ou quase nula a uma luz fraca …   Dicionário da Língua Portuguesa

  • hemeralopía — (De hemerálope). f. Med. Pérdida de visión cuando la iluminación es escasa …   Diccionario de la lengua española

  • hemeralopia — [hem΄ər ə lō′pē ə] n. [ModL < Gr hēmeralōps, day blindness (< hēmera, day + alaos, blind + ōps, EYE) + IA] a defect in the eye in which the vision is reduced in the daylight or in bright light: cf. NYCTALOPIA hemeralopic [hem΄ər əläp′ik]… …   English World dictionary

  • hemeralopía — {{#}}{{LM H19951}}{{〓}} {{[}}hemeralopía{{]}} ‹he·me·ra·lo·pí·a› {{《}}▍ s.f.{{》}} Defecto de la visión consistente en la pérdida total o parcial de la vista cuando disminuye la luz ambiente: • La hemeralopía es síntoma de falta de vitamina… …   Diccionario de uso del español actual con sinónimos y antónimos

  • hemeralopía — Eng. Hemeralopia Término equívoco que etimológicamente significa dificultad de visión en pleno día, aunque en la actualidad se emplea en sentido contrario como disminución de la agudeza visual en el crepúsculo o con luz poco intensa. Ceguera… …   Diccionario de oftalmología

  • hemeralopía — ► sustantivo femenino MEDICINA Disminución de la agudeza visual con luz poco intensa o crepuscular. SINÓNIMO [ceguera nocturna] * * * hemeralopía. (De hemerálope). f. Med. Pérdida de visión cuando la iluminación es escasa …   Enciclopedia Universal

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