A study on effect of clear corneal incision in phacoemulsification surgery on postoperative astigmatism (A study of 25 cases)
Dr. Unnati Vishwanath Shukla, Dr. Vineet Shukla, Dr. Devdatta J Gohel
Purpose: To determine the astigmatism outcomes after cataract surgery performed using clear corneal incisions. Setting: Department of Ophthalmology, Guru Gobindsingh Government Hospital, Jamnagar. Methods: This prospective study includes 25 patients undergoing phacoemulsification with implantation of foldable acrylic intraocular lens through a corneal tunnel incision between 2016-2017. Clear corneal incision was made in all the patients. Astigmatism was measured by keratometry readings before surgery and 5rd, 15th, and 45th days postoperatively. Results: The results of our study are as follows- most of the patients of our study were between the age group of 41-70 years. Females (56%) outnumbered males (44%) in our study. Majority of the patients (56%) had preoperative astigmatism of 0.50D. Majority of the patients (48%) undergoing phacoemulsification through clear corneal incision had astigmatism of 0.6-1.5D on day 5 postoperatively. On day 15 postoperatively 36% of the operated patients had astigmatism between 0.6-1.0 D which further increased to 44% on day 45 postoperatively. The mean astigmatism was 2.31D, 1.99D and 1.55D on 5, 15 and 45 postoperative day. Mean postoperative astigmatism regressed from 5th to 45th postoperative days by 0.75D. Majority (80%) of patients had BCVA of 6/9-6/12. The incidence of against the rule astigmatism was more (56%) in patients undergoing phacoemulsification in which clear corneal incision was made. Conclusions - Cataract surgery using superotemporal clear corneal incision induced significantly less surgically induced astigmatism in the early postoperative period.