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Definition of Nyctanopia

Nyctanopia: Impaired vision in dim light and in the dark, due to impaired function of the rods in the retina. Nyctanopia is a classic finding with vitamin A deficiency. Also known as day sight, nocturnal amblyopia, and nyctalopia.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 3/19/2012

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