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Decreased ability to see in reduced illumination. Seen in patients with impaired rod function; often associated with a deficiency of vitamin A.
[nyct- + G. alaos, obscure, + ōps, eye]
Farlex Partner Medical Dictionary © Farlex 2012
sight(sit) [AS. sihth]
1. The power or faculty of seeing.
2. Range of sight.
The ability to see that occurs in persons who are blind because of a brain lesion rather than damage to the eye. It is manifested by their being able to reach for and track an object. These individuals apparently do not know they can see.
day sightNight blindness.
night sightDay blindness.
Medical Dictionary, © 2009 Farlex and Partners