The eye itself, called the eyeball, is a hallow sphere. its wall is composed of three coats called humors that help maintain its shape.

Lens: is the main focusing apparatus of the eye.
Sclera: is a thick white connective tissue (white of the eye) also called fibrous tunic.
Cornea: Through which light enters the eye. The transparent anterior portion of the eyeball.
Choroid: A blood-rich nutritive tunic that contains a dark pigment. This pigment prevents light from scattering inside the eye.
Ciliary Body: To which the lens is attached by a