Effects of OASIS iris expander in phacoemulsification surgery of cataract with small pupil / 眼科新进展

ABSTRACT

Objective To assess the outcomes of OASIS iris expander in phacoemulsification surgery of cataract with small pupil.Methods A prospective case-control study was conducted in 22 microcoria cataract patients (22 eyes).And they were randomly divided into group A and B,in which the pupils of group A were dilated by tearing instruments in 13 eyes,and the pupils of group B were dilated using OASIS iris expander in 9 eyes.All patient underwent phacoemulsification with 3.2 mm clear corneal incision and were followed up at postoperative 1 week,1 month,3 months and 6 months.Finally,the best corrected visual acuity (BCVA),intraocular pressure (IOP),corneal endothelial cell counts,pupil size before and after surgery were recorded and analyzed by an independent sample t test.Results All procedures were completed successfully by the same skilled doctor.Intraocular lenses were implanted in capsule completely,and no complications occurred.At 6 months after operation,patients'BCVA in group A (0.41 ± 0.30) and group B (0.77 ± 0.23) was significantly higher than that in group A (0.17 ±0.14) and group B (0.16 ±0.14) before operation,but there was no statistical difference between the two groups (all P ＞0.05);whereas there was no significant change in the IOP of group A and B at 6 months after operation (1 kPa =7.5 mmHg) and before operation [(14.22 ±6.00) mmHg vs.(15.70 ± 5.70) mmHg)] (all P ＞ 0.05).Moreover,corneal endothelial cell counts in group A [(1486 ±718) cells · mm-2] and B [(1246 ±516)cells · mm-2] were significantly smaller than those before operation [(2498 ±564)cells · mm-2 vs.[(2424 ± 640) cells · mm-2],with no significant difference (P=0.091).The postoperative diameter of the pupil in group A [(4.00 ±0.88) mm] and group B [(4.70 ± 1.57) mm] after operation was larger than that in group A [(2.30 ±0.35)mm] and group B [(1.94 ±0.50)mm] before operation,and there was no statistical difference between the two groups (all P ＞0.05).Conclusions OASIS iris expander can help to dilate and hold pupils and does not affect the postoperative visual acuity and intraocular pressure in mlcrocoria cataract phacoemulsification.The postoperative pupils become larger,and it is necessary to pay attention to protect corneal endothelial cell during usage of OASIS iris expander.