Anatomy of the eye. Section of the eye showing the main structures of the eye with, in front (left) the cornea, back the sclera. The cornea through which we see the iris behind the iris the lens connected to the ciliary process by the zonular fibers. Back the glazed cavity in the center. The inner wall of the eye is covered by the retina (yellow) and the choroid that rests on the sclera. in contrast to the cornea, the optic nerve with the central artery of the retina whose vessels surround the macula (reddish area on the left of the optic nerve