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Iritis (i-RIE-tis) is inflammation that affects your eye's iris, the colored ring surrounding your pupil. The iris is a part of the middle layer of the eye (uvea), so iritis is a type of uveitis, sometimes called anterior uveitis.

The cause of iritis is often unknown. Sometimes iritis results from an underlying systemic condition or genetic factor.

Iritis is a serious condition that, if left untreated, could lead to glaucoma or vision loss. If you have symptoms of iritis, see your doctor as soon as possible.

Feb. 14, 2014