An eye is a round-shaped organ that works with the brain to provide the vision. The shape of the eye is maintained by the pressure of the aqueous humour which is the fluid that fills the front chamber of the eye.
Lens
The transparent crystalline lens of the eye is located immediately behind the iris
Cornea
Is a transparent dome which serves as the outer window of the eye. The cornea is the most powerful structure focusing light entering the eye.
Retina
The retina is the innermost layer of the eye. It is composed of nerve tissue which senses the light entering the eye.
The retina sends impulses through the optic nerve back to the brain, which translates the impulses into images that we see.
There are 4 types of the light-sensitive receptors found in the retina
Rods.
Cones that absorb long-wavelength light
Pupil
Iris
The iris is the coloured part of the eye. It is a thin diaphragm composed mostly of connective tissue and smooth muscle fibers. The iris lies between the cornea and the crystalline lens.
Optic nerve
The optic nerve is a continuation of the axons of the ganglion cells in the retina. It acts like a cable connecting the eye with the brain.
It is called cranial nerve.
Sclera
The sclera is the white, opaque portion of the eye. It provides protection and serves as an attachment for the extra ocular muscles which move the eye.