Uveitis is a collection of ocular infectious and autoimmune diseases that cause inflammation of the uvea,the vascular middle layer of the eye between the retina and the sclera, the white of the eye.

Inflammation from uveitis can affect one or both eyes and can also progress, causing damage to other parts of the eye. Other similar diseases include retinal vasculitis (inflammation of the retinal vessels) and scleritis (inflammation of the sclera).