The Eyeball By: Kyleigh Mitchell


The white outer layer of the eyeball, at the front of the eye it is continuous with the cornea.

Optic Nerve:

Each of the second pair of cranial nerves, transmitting impulses to the brain from the retina at the back of the eye.


The transparent layer forming the front of the eye.

Aqueous Humor:

The clear fluid filling the space in the front of the eyeball between the lens and the cornea.

Vitreous Humor:

The transparent jellylike tissue filling the eyeball behind the lens.


A flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the center.

Ciliary Muscle:

The part of the eye that connects the iris to the choroid. It consists of the ciliary muscle (which alters the curvature of the lens), a series of radial ciliary processes (from which the lens is suspended by ligaments), and the ciliary ring (which adjoins the choroid).


A layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.

Rods and Cones:

There are two types of photo receptors in the human retina, rods and cones. Rods are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity.


Created with images by Pexels - "beautiful close-up color" • Yandle - "My Right Eye" • skeeze - "human eye iris macro" • National Eye Institute - "Drawing of the Eye" • alex012 - "eye" • 422737 - "lasers eye iris" • plosone-phylo - "pone.0001054.g003.png" • skeeze - "cells electron microscope macro" • National Eye Institute - "Switchboard Operator"

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