nyctalopia

nyctalopia /nyc·ta·lo·pia/ (nik″tah-lo´pe-ah)

1. night blindness.

2. in French (and incorrectly in English), day blindness.

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nyc·ta·lo·pi·a (nkt-lp-)

n.

A condition of the eyes in which vision is normal in daylight or other strong light but is abnormally weak or completely lost at night or in dim light and that results from vitamin A deficiency, disease, or hereditary factors. Also called night blindness.

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nycta·lopic (-lpk, -lpk) adj.

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nyctalopia

[nik′təlō′pē·ə]

Etymology: Gk, nyx, night, alaos, obscure, ops, eye

poor vision at night or in dim light resulting from decreased synthesis of rhodopsin, vitamin A deficiency, retinal degeneration, or a congenital defect. Also called day sight, night blindness. nyctalopic, adj.

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nyctalopia (nikˈ·t·lōˑ·pē·),

n reduction in the ability to see in faint light, as at night, due to con-genital defects, vitamin A deficiency, decreased rhodopsin synthesis, or degeneration of the retina. Also called
night blindness or
day sight.

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nyctalopia

night blindness.

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hemeralopia

Term used to mean either night blindness in which there is a partial or total inability to see in the dark associated with a loss of rod function or vitamin A deficiency; or day blindness in which there is reduced vision in daylight while vision is normal in the dark. Syn. nyctalopia (this term is only synonymous with night blindness); night sight (this term is only synonymous with day blindness). See girate atrophy; congenital stationary night blindness; choroideremia; Oguchi's disease; retinitis pigmentosa.