The colored portion of the eye is composed of two parts: the IRIS (4 letters) and the uvea (4 letters). The IRIS is the pigmented, muscular diaphragm that surrounds the pupil and controls the amount of light entering the eye. The uvea is the middle layer of the eye, which contains the choroid, ciliary body, and IRIS. Together, the IRIS and uvea form the colored portion of the eye, which gives the eye its color.