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Nyctalopia (Night blindness)
Often a dangerous disorder, night blindness results in the inability to see well in the dark or under dim light. It may be a consequence of nutritional deficiency (notably Vitamin A) and may also result from a decreased synthesis of rhodopsin, retinal degeneration, or may be due entirely to a congenital defect.
Night blindness is usually diagnosed when an individualís Eyes do not readily adjust in a few moments, from daylight, when they enter a dark room.
1. Anonymous. Zinc-responsive night blindness in sickle cell anemia. Nutr Rev 1982;40:175-77.