night sight


sight

 [sīt] vision.a thing seen.far sight hyperopia.near sight myopia.night sight hemeralopia.

hem·er·a·lo·pi·a

(hem'ĕr-ăl-ō'pē-ă), Inability to see as distinctly in a bright light as in reduced illumination; seen in patients with impaired cone function. Synonym(s): day blindness, hemeranopia, night sight [G. hēmera, day, + alaos, obscure, + ōps, eye]

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.