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Injectable ring expands pupil safely, effectively

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BERLIN — A new injectable iris ring enlarges the pupil during cataract surgery without causing trauma, protecting the iris sphincter intraoperatively and returning the iris to its normal shape postoperatively.

"The iris ring is an effective tool to use in small pupil phaco cases," Boris Malyugin, MD, PhD, said at the European Society of Cataract and Refractive Surgeons meeting here.

The temporary pupil expansion device has four circular loops to hold the iris at equidistant points, according to Dr. Malyugin. He conducted a study examining clinical results of the ring in 38 eyes of 37 patients. Patients had an average nucleus density of 2.9 ± 0.6, and were not responsive to conventional pupil dilation techniques.

Results from the study showed that the ring had minimal surgical complications and was well-tolerated. The most common complication was transitory IOP rise in six eyes, Dr. Malyugin said.

The study also examined the injection method's impact on five cadaver irises. It found that the ring had limited impact on the iris pigmented epithelial layer.