Basic Anatomy of the Eye

The eye is composed of three layers. The exterior of the eyeball is a tough white fibrous layer called the sclera, which merges into the clear cornea. Inside this, there is another layer called the uvea, which is rich in blood vessels. The uvea traditionally includes three areas: the iris, the ciliary body and the choroid. The innermost layer of the eyeball is the retina, composed of cells that react to the light. These cells communicate with the optic nerve and ultimately the brain, allowing us to see. 

You can learn more about the anatomy of the eye in this video: 

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