Comparison of different corneal incisions on corneal refraction after phacoemulsification and foldable intraocular lens implantation

Abstract

Objective To compare the effect of different corneal incisions on corneal refraction after phacoemulsification and foldable intraocular lens implantation.Methods 42 eyes of 35 patients with cataract were divided into two groups randomly:group A,received temporal clear corneal incision(18 eyes of 18 cases),group B,received superior(11:00) clear corneal incision (24 eyes of 17 cases).Patients were examined preoperatively and 1 day,1 week,1 month and 3 months postoperatively by using slit-lamp microscope and corneal topography,and visual acuity also was examined.Results The visual acuity in group A was better than that in group B at 1 day postoperatively.But at 1 week,1 month,2 months postoperatively,the difference of visual acuity between two groups was not statistically significant.At 1 day preoperatively and at 1 day,1 week,1 month,2 months postoperatively,the mean astigmatism were (0.543 ± 0.264) D,(0.821 ±0.317)D,(0.732±0.320)D,(0.690±0.283)D,(0.657 ±0.233)D and (0.51 ±0.27)D in group A respectively.And at the same time points,the mean astigmatism in group B were (0.568 ± 0.243)D,(1.092 ± 0.357) D,(0.987 ± 0.257) D,(0.934 ± 0.312) D and (0.866 ± 0.371) D respectively.The mean astigmatism in group A was lower than in group B,and the difference was statistically significant (P ＜0.05).The superior incision group showed against-the-rule astigmatic changes,whereas with-the-rule astigmatism was seen in the temporal incision group.Conclusion The visual acuity in the temporal incision group was better than that in superior incision group at 1 day postoperatively.And the mean astigmatism changes in group A was lower than in group B. Key words: Phacoemulsification, cataract; Incision, corneal; Refraction, corneal