The outer layer called the fibrous tunic which consists of the sclera and the cornea. The sclera and cornea make up the exterior layers. Layers Of The Retina The Retina Eye Anatomy Eye Health It delivers nourishment through blood and oxygen supply to. . The eye is a fluid-filled sphere enclosed by three layers of tissue Figure 111. These remarkable features of our eye are enabled by the complex structure of the eyeball. The vascular layer of the eye known as the choroid contains the connective tissue. The eyeball consists of three layers. The internal structures of the eye consist of three layers of tissue arranged concentrically. Most of the outer layer is composed of a tough white fibrous tissue the sclera. Pigmented outer layer formed by a single layer of. Benjamin King MD Cells of the Retina Histological Layers of the. Major Ocular Structures. The inner layer of the eye is formed by th