Surrounding the internal components of the eyeball are the walls of the eyeball. They consist of three layers: an outer fibrous layer, a middle vascular layer, and an inner retinal layer (Fig. 8.108).
The outer fibrous layer consists of the sclera posteriorly and the cornea anteriorly.
The middle vascular layer consists of the choroid posteriorly and is continuous with the ciliary body and iris anteriorly.