Cornea
Light enters the eye through a thin membrane called the cornea.It forms the transparent bulge on the front surface of the eyeball. Most of the refraction for the light rays entering the eye occurs at the outer surface of the cornea.
Retina
Eyes' lens system forms an image on a light-sensitive screen called the retina. The retina is a delicate membrane having enormous number of light-sensitive cells.
Crystalline Lens
The crystalline lens merely provides the finer adjustment of focal length required to focus objects at different distances on the retina.
Iris
We find a structure called iris behind the cornea. Iris is a dark muscular diaphragm that controls the size of the pupil.
Pupil
The pupil regulates and controls the amount of light entering the eye.
Aqueous Humor
Aqueous humor is the clear liquid inside the front part of the eye. It nourishes the eye and keeps it inflated.
Ciliary Muscles
The ciliary muscle is an intrinsic muscle of the eye formed as a ring of smooth muscle in the eye's middle layer. It controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humor into Schlemm's canal.
Optic Nerve
The optic nerve is comprised of millions of nerve fibers that send visual messages to your brain to help you see. You have an optic nerve at the back of each eye that connects directly to your brain.
Vitreous Humor
The vitreous humor is a transparent, colorless, gelatinous mass that fills the space in the eye between the lens and the retina. It is surrounded by a layer of collagen called the vitreous membrane separating it from the rest of the eye.