Vitamin A actually is a group of compounds that play an important role in vision, bone growth and health of the immune system. Vitamin A also causes the surface of the eye and skin to be effective barriers to bacteria and viruses, reducing the risk of eye infections, respiratory problems and other infectious diseases. A lack of vitamin A causes the cornea to become very dry, leading to clouding of the front of the eye and vision loss. Vitamin A deficiency also causes damage to the retina, which also contributes to blindness. Good sources of vitamin A are milk, eggs, liver, cereals, darkly colored orange or green vegetables (such as carrots, sweet potatoes, pumpkin, and kale), and orange fruits such as cantaloupe, apricots, peaches, papayas, and mangos
