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Lack of vitamin A, first causes night blindness or inability to see in dim light. Night blindness is due to impairment in dark adaptation.

Night blindness, officially known as nyctalopia, is inability to adapt to dark lighting conditions. When a person can’t see well enough to discern contrasting images under low lighting conditions, blindness can result.

The retina is well supplied with an important chemical substance called rhodopsin, or “visual purple”.
Light falling on the retina brings about certain chemical changes in the rhodopsin and other substances present in the rods and cones. These changes occur very rapidly, but large quantities of vitamin A are needed to bring this about. If there is any marked deficiency of vitamin A, night blindness may occur. This can usually be corrected by administering suitable amounts of vitamin A in the diet.

healthvitaminsguide.com, 2006

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