Iritis is a condition in which the colored area of the eye, called the iris, is irritated, inflamed, and swollen. Iritis is a type of uveitis, which is the inflammation of the middle section of the eye called the uvea. Iritis may occur as a result of a number of health conditions, including several autoimmune diseases. Another type of uveitis, called pars planitis, could possibly be connected to Crohn's disease and multiple sclerosis. Iritis often affects otherwise healthy people for an unknown reason. Iritis symptoms can include an ache, pain, or general discomfort in the eye, discoloration in the white part of the eye, feeling sensitive to light, eye floaters, and blurry vision.