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nyctalopia |
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nyctalopia /nyc·ta·lo·pia/ (nik″tah-lo´pe-ah)
1. night blindness. 2. in French (and incorrectly in English), day blindness.
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. nyctalopia [nik″tah-lo´pe-ah] 1. night blindness. 2. sometimes incorrectly used as a synonym for hemeralopia.
nyctalopia (nikˈ·t 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. nyctalopia night blindness.
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. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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