The white part of the eye is called the sclera. It is a strong layer of tissue that covers nearly the entire surface of the eyeball and is continuous with the stroma layer of the cornea. The sclera is a protective covering that wraps over most of the eyeball and helps maintain its shape, and it is made of tough collagen fibers that give it strength. The sclera also provides a sturdy attachment for the extraocular muscles that control the movement of the eyes.