Sclera

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The sclera is the white, fibrous tissue that covers the eye. It's a tough, protective layer that extends from the cornea to the optic nerve. The sclera is made of collagen and elastic fibers.

The sclera is about 0.3–1.0 mm thick. The junction between the sclera and the cornea is called the limbus. The sclera is covered by the conjunctiva, a transparent mucus membrane that lubricates the eye.

In people with liver failure, the sclera can turn yellow. This condition is called jaundice and indicates that the liver is not filtering blood properly.

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