Vitamin A or retinol is required for normal functioning of the eyes, cell differentiation, development of fetal and helps in immune system to fight against infections. Good sources of vitamin A are dairy products, meat and liver as well as dark green leafy and yellow-orange vegetables and fruits.
Vitamin A deficiency
Vitamin A is important for the formation of rhodopsin, an important visual pigment, particularly for vision in low intensity light. Thus the initial symptom of vitamin A deficiency is night blindness. In severe vitamin A deficiency, thickening of the cornea of the eyes may occur. This may lead to total loss of vision if untreated.