Vitamin A plays an important role in normal vision. It is found in the retina in the form of visual pigments in the photoreceptor system of rods and cones.
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Vitamin A was discovered in the early nineteenth century by Dr. E. Mc Collum. He carried out experiments on rats and found that when butter and egg yolk were added to the diet of a group of rats, they were healthier and stronger are compared to the other group which were fed on lard and vegetables only.
The most serious effect of the lack of vitamin A is NIGHT BLINDNESS. Night blindness is the inability of a person to adjust to the changing intensity of light. Persons suffering from night blindness cannot see in dim light especially at night.