PMMA Expansion Ring for Managing Coloboma

Dr. Sergio Canabrava demonstrates use of his new, thinner PMMA iris expansion ring, which has alternate up and down parts to engage over and under the pupil edge. The device is used in a patient with iris coloboma, for whom a traditional iris ring would not work. The ring is inserted into the anterior chamber through a 2.2-mm clear corneal incision, and rotated into place with a Sinskey hook. The down-oriented ring parts are inserted under the pupil, then the upward parts are brought over the pupil edge. The IOL is implanted and the ring is easily disengaged, and to finish the surgery, a pupilloplasty is performed.