Conjunctiva

Clear mucus membrane that lines the surface of the eye and eye lids and covers the sclera.  Responsible for keeping the eye moist.

Sclera

White part of the eye.  Tough covering that with the cornea forms the external protective covering of the eye.

Cornea

Transparent tissue that forms the front part of the eyeball covering the iris and the pupil.  Bends light and makes up the majority of the focusing power of they eye.

Iris

A muscle, colored part of the eye in front of the crystaline lens that regulates the amount of light that enters they eye by adjusting the pupil diameter.

Pupil

Black opening in the center of the iris.

Crystalline Lens

A double convex transparent lens that refracts light onto the retina.

Posterior Capsule

A thin membrane that holds the crystalline lens in place.

Vitreous

A transparent gel like substance that allows the eye to maintain it's form.

Macula

A yellow spot on the retina where the photoreceptors are the most dense and responsible for the central vision.  Greatest concentration of cones responsible for VA and the ability to see color.

Retina

The nerve center of the eye where light is converted into an electrical signal that travels to the brain.  Rods and cones transmit these signals along the optic nerve, thereby enabling sight.

Optic Nerve

Bundle of nerve fibers that connect the retina with the brain.  Carries signals of light to the area of the brain called the visual cortex, which assembles the signals into images called vision.