Of the four main eye colors (brown, blue, green, and hazel), the rarest eye color is green. However, new classifications say another color is even rarer: gray. Brown is the most common worldwide, ...

The sclera is the white part of the eye. It is made of tough, fibrous tissue that acts as a protective covering for most of the eyeball. The sclera runs from the cornea at the front of the eye to the ...

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