title: Postoperative Corneal and Surgically Induced Astigmatism following Superior Approach Manual Small Incision Cataract Surgery in Patients with Preoperative Against-the-Rule Astigmatism.
abstract: The aim of the study was to report postoperative corneal and surgically induced astigmatism (SIA) in patients with preoperative against-the-rule (ATR) astigmatism who underwent superior approach manual small incision cataract surgery (MSICS). 58 eyes of 58 cataract patients with preoperative ATR astigmatism were involved in this study. All patients had operable cataracts and underwent superior approach MSICS. Keratometric (K) readings were taken prior to surgery and at 12 weeks after surgery. Centroid values of SIA, preoperative astigmatism, and postoperative astigmatism were calculated using Cartesian coordinates based analysis. Wilcoxon signed rank test was used to compute statistical significance between mean preoperative and postoperative corneal astigmatism. Cohen'sdwas used as effect size measure. Centroid values of 1.42 D × 179, 2.48 D × 0, and 1.07 D × 1 were recorded, respectively, for preoperative astigmatism, postoperative astigmatism, and SIA. Wilcoxon signed rank test indicated that mean ± SD postoperative corneal astigmatism (2.80 ± 1.40 D) was statistically significantly greater than preoperative corneal astigmatism (1.49 ± 1.34 D),Z= -6.263,p< 0.0001. A high Cohen'sdof 1.32 was found. Our results suggest statistical and clinically significant greater postoperative corneal astigmatism than preoperative corneal astigmatism for ATR astigmatism cataract patients who underwent superior approach MSICS.
authors.affiliation: Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
authors.forename: Edmund
authors.identifier: 0000-0002-1577-7950
authors.initials: E
authors.lastname: Arthur
authors.affiliation: Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
authors.forename: Ahmed Abdul
authors.initials: AA
authors.lastname: Sadik
authors.affiliation: Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
authors.forename: David Ben
authors.identifier: 0000-0002-4634-3637
authors.initials: DB
authors.lastname: Kumah
authors.affiliation: Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
authors.forename: Eugene Appenteng
authors.identifier: 0000-0002-2059-7823
authors.initials: EA
authors.lastname: Osae
authors.affiliation: Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
authors.forename: Felix Agyemang
authors.initials: FA
authors.lastname: Mireku
authors.affiliation: Ruebsam Eye Clinic, St. Dominic's Hospital, P.O. Box 59, Akwatia, Ghana.
authors.forename: Frank Yeboah
authors.initials: FY
authors.lastname: Asiedu
authors.affiliation: Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
authors.forename: Reynolds Kwame
authors.initials: RK
authors.lastname: Ablordeppey