2. The human eye can distinguish about 10 million different colors.
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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. Babies' eyes do not produce tears until the baby is approximately six to eight weeks old.
5. Vitamin A can help to improve eyesight because it is needed by retina for forming specific metabolite.
