Iritis is an inflammation of the iris and occasionally includes the ciliary body (the circumferential tissue inside the eye located behind the iris). In iritis, small white blood cells from the inflamed area and excess protein leaked from the small blood vessels inside the eye float into the aqueous fluid between the iris and the cornea.
The symptoms include: redness, throbbing pain, light sensitivity, tearing, and the pupil of the affected eye may become smaller.
The cause of iritis is unknown, but it generally runs its course in six to eight weeks.