eye anatomy

Cornea

Light enters through a transparent part of the sclera at the front of the eye.

Optic Nerve

the nerve that carries neural impulses from the eye to the brain

Iris

a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening

Pupil

the adjustable opening in the center of the eye through which light enters

Sclera

A white, tough and fibrous protective external layer of the eye.

Lens

the transparent structure behind the pupil that changes shape to help focus images on the retina, specifically the fovea centralis

Retina

Internal layer of the eye that contains photoreceptors.

Choroid

Intermediate layer, provides blood supply and support to the retina and optic nerve, and to absorb light to prevent reflections within the eye

Ciliary Muscle

Muscle that helps focus light on the retina by controlling the curvature of the lens of the eye

Aqueous Humor

In the anterior chamber of the eye, a clear, watery fluid maintains the shape of the cornea and provides

oxygen and nutrients for the surrounding cells.

Vitreous Humor

jellylike substance found behind the lens in the posterior cavity of the eye that maintains its shape