Now, the sclera is composed of a protein known as collagen, as well as elastic fibers. And the sclear serves a protective purpose. It basically protects our eye from various forms of damage. Now, the next portion we're going to discuss is the cornea. The cornea is the outside portion found in the front of the eye. And unlike the sclera, the cornea is clear, it's transparent, and that means it absorbs very little of the light and it allows most of the light to actually pass through.