The uvea is the middle layer of the eye, located between the outer sclera and the inner retina. It consists of three main parts: the iris, which controls the size of the pupil; the ciliary body, which helps focus the lens; and the choroid, a layer rich in blood vessels that supplies nutrients to the eye. The uvea plays a crucial role in vision by regulating light entering the eye and maintaining the health of the retina. Conditions affecting the uvea, such as uveitis, can lead to vision problems and require medical attention to prevent complications.