The best description of blindness caused by vitamin A deficiency in developing countries is that it is

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The blindness caused by vitamin A deficiency is permanent once it occurs,but it can be prevented by administration of periodic supplements.Vitamin deficiencies may be exacerbated by infections that increase nutrient needs,but the deficiencies themselves are not infectious.Blindness may cause early death but is itself not fatal.Vitamin A deficiency may cause both night blindness and complete blindness.

The Best Description of Blindness Caused by Vitamin a Deficiency