Effect of Incision Length and Incision Site on Surgically Induced Astigmatism in Sutureless Cataract Surgery

Park, In Chul; Lee, Tae Hun; Park, Jong Il; Lee, Kyung Hun

Abstract

The refractive effects of incision parameters on surgically induced astigmatism in sutureless cataract surgery were studied retrospectively by automatic keratometeric evaluation. 215 eyes undergoing phacoemulsification and posterior chamber intraocular lens implantation were divided into five groups according to the incision length, direction and location : group 1 (14 eyes), 3.5mm superior scleral incision : group 2 937 eyes), 3.2mm temporal clear corneal incision : group 3 (24 eyes), 3.2mm temporal scleral incison : group 4 (24 eyes), 5.5mm superior scleral incision : group 5 (116 eyes), 5.5mm temporal scleral incision. All eyes were examined by keratometry preoperatively as well as at 1 days, at 1 and 2 weeks and at 1 and 2 months after surgery. Cravys vector analysis was performed to calculate the surgically induced astigmatism and keratometric readings were converted to polar values to estimate the mean postoperative keratometric astigmatism. After two postoperative months, mean induced atigmatism was -0.37+/-0.36D in Group 1, 0.27+/-0.44D in Group 2, 0+/-0.33D in Group 3, -0.74+/-0.46D in Group 4 and 0.22+/-0.63D in Group 5. There fore we constructed our own nomogram for managing astigmatism at cataract surgery.