Surgically Induced Astigmatism after Temporal Clear Corneal Incision in Sutureless Cataract Surgery

Hu, Young Jae; Joo, Choun Ki

Abstract

The purpose of the study was to evaluate the postoperative change of keratometric astigmatisms according to preoperative. A total of 254 eyes were underwent phacoemulsification and foldable silicone posterior chamber lens implantation using 3.2mm temporal clear corneal incision. The subjects were divided into five groups: Group 1(aganist the rule >1.25D), Group 2(ATR < OR =1.0D), Group 3(with the rule < OR =1.0D), Group 4(WTR >1.25D) and emmetropia according to preoperative astigmatisms. Mean preoperative astigmatism was -0.19+/-0.97D. At 6 months after operation, mean surgically induced stigmatism(SIA) was 0.41+/-0.60, and remained astigmatism was 0.27+/-0.98D. SIA in group 1, 2 was less than in group 3, 4. The difference was stastically significant at 6 months after operation(p<0.05). The change of astigmatism in group 1 was -1.83+/-0.48D preoperatively, -0.75+/-0.50D at 6 months after operation, in group 2 -0.58+/-0.28D preoperatively, 0.02+/-0.50D at 6 months, in group 3 0.45+/-0.25D preoperatively, 0.50+/-0.43D at 6 months, and in group4 1.90+/-0.25D preoperatively, 3.17+/-0.23D at 6 months. In group 4, the proportion of patients who had astigmatism within 1D was only 20% at months after operation and none 6 months after operation. In conclusion, temporal clear corneal incision induces more astigmatisms in preoperative ATR group than in WTR group. And the Patients who have preoperative astigmatism larger than WTR 1.25D seem to be needed an additional correction of astigmatism or change the location of incision in temporal clear corneal incision cataract surgery.