Vitamin A;

The first recognized fat-soluble vitamin is vitamin A that is found in the body in its three active forms ; retinal, retinol and retinoic acid that are collectively known as retinoid.

They are essential for normal vision, support preproduction and growth , participate in protein synthesis and maintain healthy epithelial tissue. The RDA of vitamin A is 900 micro g per/day foe male adult and 700micro g per/day for female adult.

Vitamin Deficiency;

They inadequate intake of vitamin A may lead to vitamin A deficiency diseases, which affect more than 100 million children worldwide . Following are the detectable signs and symptoms vitamin A deficiency:

Night blindness:

The first detectable signs of vitamin A deficiency is nyctalopia, which is characterized by ‘’the inability to see well at night or in poor light’’. The main cause for night blindness is the insufficient intake of vitamin A . The retina, the back of the eye does not receive enough retinal to regenerate the visual pigment bleached by light.

Blindness:

Apart for blindness, the complete blindness failure to see at all ‘ is also attributed at cornea(front of the eye) due to the deficient intake of vitamin A . Xerophthalmia (dry eye) is the blindness caused by severe vitamin A deficiency and is a consequence of keratinization of the conjunctival nd corneal surfaces of the eyes which may be followed by infection stages.

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