Part of the eye, consisting collectively of the iris, the choroid of the eye, and the ciliary body: In Rob's biology book, there was a diagram of the urea which was the middle of the three concentric layers involved in the eye.

The "iris" is the circular, colored curtain of the eye that surrounds the pupil.

The "choroid" of the eye is 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" is the 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.

The word uvea comes from the Latin word uva for "grape". One suggested idea behind this strange relationship to the eye was that, if the stem is removed from a grape, the hole looks like the pupil of the eye and the grape resembles the eyeball.