The iris cerclage suture for permanent mydriasis: a running suture technique.

Permanent mydriasis can be a disabling condition. The author describes an iris cerclage running suture technique for the treatment of permanent mydriasis caused by diffuse iris sphincter damage. A long, curved transchamber needle on 10-0 polypropylene is passed in and out of the anterior chamber through limbal paracentesis openings while weaving the needle through the iris near the pupillary margin to form the cerclage. The technique minimizes stretching and distortion of the iris and creates a pupil that is precisely sized and rather round.