Abstract:

Objective  To compare the efficacy of the Malyugin Ring and OASIS iris expander applyied on the phacoemulsification surgery for the microcoria cataracts. Design Prospective comparative case series. Participants 20 microcoria cataract patients (20 eyes) from Beijing Tongren Hospital. Methods 20 microcoria cataract cases (20 eyes)  were randomly divided into 2 groups. The pupils were dilated by Malyugin Ring in 11 eyes (group 1), and by OASIS iris expander in 9 eyes (group 2). 3.2 mm clear corneal incision were used in phacoemulsification. All cases were followed up at postoperative 1 week and 1, 3, 6 months. Main Outcome Measures The best corrected visual acuity (BCVA), intraocular pressure(IOP), corneal endothelial cell counts, and pupil size. Results All surgery was completed successfully by the same doctor. Intraocular lens were implanted in capsule, and no complications occurred. The preoperative BCVA of group 1 and 2 was 0.18±0.16 and 0.16±0.14 respectively (P=0.836). The BCVA of group 1 and 2 was 0.53±0.40 and 0.77±0.23 respectively (P=0.124) at 6 months after surgery. At the 6 months after surgery, the IOP of group 1 and group 2 was 12.4±2.2 mmHg and 12.7±6.4 mmHg (P=0.364), the corneal endothelial cell count was 2089±729/mm2 and 1246±516/mm2 (P=0.007); the pupil diameter was 3.50±1.24 mm and 4.70±1.57 mm respectively, compared with the preoperative pupil diameter (2.23±0.85 mm and 1.94±0.50 mm respectively)(P=0.042, 0.049). Conclusion  Malyugin Ring and OASIS iris expander are safe and effective in microcoria cataract phacoemulsification. The pupils were larger postoperatively. Comparing with OASIS iris expander, Malyugin Ring helps to reduce the loss of intraoperative corneal endothelial cells.

Key words: cataract/surgery, microcoria, iris expander