The uvea consists of the iris, ciliary body, and choroid. The classification of uveitis, established by the SUN (Standardization of Uveitis Nomenclature) Working Group, is based on the primary site of inflammation. Anterior uveitis (red) involves the iris and anterior ciliary body; intermediate uveitis (blue) involves the posterior ciliary body and the pars plana and/or the peripheral retina; posterior uveitis (green) involves the choroid, either primarily or secondarily from the retina.