The sclera is the white outer layer of the eyeball, providing structure and protection. It is made of dense connective tissue and helps maintain the shape of the eye. The sclera covers most of the eyeball, except for the front part, where the clear cornea is located. In addition to its protective role, the sclera serves as an attachment point for the eye muscles, which are responsible for moving the eye. It also contains blood vessels and nerves that support the overall health of the eye, contributing to vision and function.