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Uveitis: Inflammation of the uvea, the part of the eye that collectively refers to the iris, the choroid of the eye, and the ciliary body:

• The iris: The circular, colored curtain of the eye that surrounds the pupil.
• The choroid of the eye: The thin vascular middle layer of the eye that is situated between the sclera (the white of the eye) and the retina (the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain).
• The ciliary body: A body of tissue that connects the iris with the choroid and includes a group of muscles which act on the lens of the eye to change its shape.

Uveitis as a rule signifies inflammation involving the iris, choroid, and ciliary body -- all three components of the uveal tract.

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