vitamin a deficiency symptoms

The most frequent reason of sightlessness in developing countries is vitamin A deficiency (VAD). The World Health Organization (WHO) approximates 13.8 million children to have a number of degrees of visual loss related to vitamin A deficiency.Night blindness and its degenerate condition, xerophthalmia, are indicators of VAD, as VAD can also show the way to impaired resistant function, cancer, and birth defects.

Night blindness is the complexity for the eyes to regulate to dim light. Affected persons are not capable to differentiate images in low levels of enlightenment. People with night blindness have deprived exposure in the darkness, but see generally when sufficient light is present.