iridotomy /ī′ridot″əmē/ [Gk, iris + temnein, to cut] , a surgical incision into the iris of the eye. It is performed to relieve occlusion of the pupil, to enlarge the pupil in cataract extraction, or to treat postoperative glaucoma. Topical anesthetic drops are used. An incision is made through the cornea, and a cut is made transversely across the sphincter fibers of the iris. Atropine and an antibiotic may be instilled, and a dressing and shield are applied. After surgery the dressing is observed for signs of drainage. Excessive pain is abnormal. See also iridectomy, iris.
