Arthur Edmund, Sadik Ahmed Abdul, Kumah David Ben, Osae Eugene Appenteng, Mireku Felix Agyemang, Asiedu Frank Yeboah, Ablordeppey Reynolds Kwame
Department of Optometry and Visual Science, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
Ruebsam Eye Clinic, St. Dominic's Hospital, P.O. Box 59, Akwatia, Ghana.
J Ophthalmol. 2016;2016:9489036. doi: 10.1155/2016/9489036. Epub 2016 Dec 28.
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 () 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's was 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), = -6.263, < 0.0001. A high Cohen's of 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.
本研究的目的是报告术前为逆规散光（ATR）的患者接受上方入路手法小切口白内障手术（MSICS）后的角膜散光和手术诱导散光（SIA）情况。本研究纳入了58例术前有ATR散光的白内障患者的58只眼。所有患者均患有可手术治疗的白内障，并接受了上方入路MSICS手术。在手术前和手术后12周进行角膜曲率计（）读数测量。使用基于笛卡尔坐标的分析方法计算SIA、术前散光和术后散光的质心值。采用Wilcoxon符号秩检验计算术前和术后平均角膜散光之间的统计学显著性。使用Cohen's 作为效应量指标。术前散光、术后散光和SIA的质心值分别记录为1.42 D×179、2.48 D×0和1.07 D×1。Wilcoxon符号秩检验表明，术后角膜散光平均值±标准差（2.80±1.40 D）在统计学上显著大于术前角膜散光（1.49±1.34 D）， = -6.263， < 0.0001。发现Cohen's 较高，为1.32。我们的结果表明，对于接受上方入路MSICS手术的ATR散光白内障患者，术后角膜散光在统计学和临床上均显著大于术前角膜散光。
