Abstract
Objective. This is prospective randomized control trial to compare the mean keratometric corneal astigmatism diopter power (not surgical induced astigmatism) among preop and one-month and three-month postop phacoemulcification of either a clear temporal corneal incision or a superior scleral tunnel Incision, using only keratometric astigmatic power reading to evaluate the difference between the two cataract surgery incisions. Methods. 120 patients (134 eyes) underwent phacoemulcification were randomly assigned to two groups: Group A, the clear temporal corneal incision group, and Group B, the superior scleral tunnel incision group. SPSS11.5 Software was used for statistical analysis to compare the postsurgical changes of cornea astigmatism on keratometry. Results. The changes of corneal astigmatic diopter in Groups A and B after 3 month postop from keratometric reading were 1.04 + 0.76 and 0.94 + 0.27, respectively (P = .84 >.05), which showed no statistic significance difference. Conclusion. The incision through either temporal clear cornea or superior scleral tunnel in phacoemulcification shows no statistic difference in astigmatism change on keratometry 3-month postop.
Highlights
Along with the availability of the foldable intraocular lens, the incision in the phacoemulsification cataract extraction has developed from sclera incision to the clear corneal incision
This study aims to find out that the temporal clear corneal incision will not create more SIA than superior scleral incision in three months Journal of Ophthalmology
They were randomly assigned to Group A or B for either the phacoemulsification through temporal clear corneal incision or the phacoemulsification through superior scleral tunnel incision with intraocular lens implant
Summary
Along with the availability of the foldable intraocular lens, the incision in the phacoemulsification cataract extraction has developed from sclera incision to the clear corneal incision. Cataract surgeries by phacoemulsification through clear corneal incision have become the principal method for cataract surgery because of its bloodless and fast approach. The postop SIA (surgical induced astigmatism) has always been a concern to most of surgeons. It has always been assumed that scleral incision would minimize the postop astigmatism. Masket has advocated scleral pocket with suture under tonometric and keratometric control to reduce SIA [1]. Altan-Yaycioglu et al indicated in their study that temporal and superotemporal incisions result in only small astigmatic changes [2]
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