Anatomy of the Human Eyeball

Sclera

Protective white outer surface of the eyeball.

Iris

Pigmented outer layer; contains blood vessels.

Cornea

Very sensitive part of the eye to touch.

Ciliary Muscle

Controls the shape of the lens for focusing.

Aqueous Humor

Fluid in anterior chamber; continually replenished.

Vitreous Humor

Fluid in posterior chamber; not replenished.

Choroid

Contains blood vessels; nourishes the retina.

Retina

Detects light and initiates neural messages.

Macula

Yellow pigmented spot for central vision.

Fovea

Area of the retina for best vision.

Optic Disk

Point where axons leave the eye.

Optic Nerve

Axons of retinal neurons transmitting visual information.