The term 'UVEA' is a four-letter crossword solution for the term 'EYE LAYER CONTAINING THE IRIS'. Uvea is the medical term for the middle layer of the eye, which contains the iris. This layer is also known as the uveal tract or uveal coat and is composed of the choroid, ciliary body, and iris. The uvea is responsible for controlling the amount of light entering the eye and helps to regulate the eye's internal pressure.