1.Healthy eyes are so sensitive to light that a candle burning in the dark can be detected 1.6km (1 mile) away.

2.The human eye can distinguish about 10million different colors.

3.The cornea in eye is the only living tissue in the human body that does not contain any blood vessels.

4.All babies are colour blind when they are born.

5.Vitamin A can improve eye sight of a person because our retina needs vitamin A for forming of a specific metabolite.