Vitamin A Deficiency (VAD) is the number one cause of childhood blindness; it also compromises the immune system, which, in turn, increases the risk of death from diseases such as malaria, measles and diarrhea. Helen Keller International works to deliver sight-and life-saving vitamin A to children under 5 and postpartum mothers. Vitamin A Supplementation is considered to be the most cost-effective intervention to save the sight and lives of children; the total cost of delivering the vitamin A is just $1.00 per child per year!