Overview

The eye itself can be divided into 3 concentric tunics plus the internal components.  The three tunics from the outside surface of the eye inward are, (1) the fibrous tunic (cornea and sclera), (2) the vascular tunic (iris, ciliary body, and choroid) and (3) the neuroectodermal (nervous) tunic (retina).  These tunics inwardly decrease in size as they become more specialized.  Internally, the eye contains the lens and the aqueous and vitreous humors.

Below is a breakdown of the eye structure:

The eye is rough composed of three concentric tunics plus the internal components. These tunics are :

1. The fibrous tunic : The fibrous tunic is composed of the cornea and sclera.

2. The vascular tunic : The vascular tunic is composed of the iris, ciliary body and choroid.

3. The nervous tunic : The nervous tunic is composed of the retina.

Additional critical structures associated with the eye include the lens, the aqueous humor, the vitreous humor and the optic nerve.