Hirnschall Nino, Wiesinger Jörg, Draschl Petra, Findl Oliver
Vienna Institute for Research in Ocular Surgery (VIROS), A Karl Landsteiner Institute, Hanusch Hospital, 1140 Vienna, Austria.
Vienna Institute for Research in Ocular Surgery (VIROS), A Karl Landsteiner Institute, Hanusch Hospital, 1140 Vienna, Austria ; Moorfields Eye Hospital NHS Foundation Trust, London EC1V 2PD, UK.
J Ophthalmol. 2015;2015:706508. doi: 10.1155/2015/706508. Epub 2015 Jun 25.
Purpose. To evaluate influencing factors on the residual astigmatism after performing peripheral corneal relaxing incisions (PCRIs) during cataract surgery. Methods. This prospective study included patients who were scheduled for cataract surgery with PCRIs. Optical biometry (IOLMaster 500, Carl Zeiss Meditec AG, Germany) was taken preoperatively, 1 week, 4 months, and 1 year postoperatively. Additionally, corneal topography (Atlas model 9000, Carl Zeiss Meditec AG, Germany), ORA (Ocular Response Analyzer, Reichert Ophthalmic Instruments, USA), and autorefraction (Autorefractometer RM 8800 Topcon) were performed postoperatively. Results. Mean age of the study population (n = 74) was 73.5 years (±9.3; range: 53 to 90) and mean corneal astigmatism preoperatively was -1.82 D (±0.59; 1.00 to 4.50). Mean corneal astigmatism was reduced to 1.14 D (±0.67; 0.11 to 3.89) 4 months postoperatively. A partial least squares regression showed that a high eccentricity of the cornea, a large deviation between keratometry and topography, and a high preoperative astigmatism resulted in a larger postoperative error concerning astigmatism. Conclusions. PCRI causes a reduction of preoperative astigmatism, though the prediction is difficult but several factors were found to be a relevant source of error.
目的。评估白内障手术中进行周边角膜松解切口（PCRI）后残余散光的影响因素。方法。这项前瞻性研究纳入了计划接受PCRI白内障手术的患者。术前、术后1周、4个月和1年进行了光学生物测量（IOLMaster 500，德国卡尔蔡司医疗技术公司）。此外，术后还进行了角膜地形图检查（Atlas 9000型，德国卡尔蔡司医疗技术公司）、ORA（眼反应分析仪，美国瑞特眼科仪器公司）和自动验光（RM 8800 Topcon自动验光仪）。结果。研究人群（n = 74）的平均年龄为73.5岁（±9.3；范围：53至90岁），术前平均角膜散光为-1.82 D（±0.59；1.00至4.50）。术后4个月，平均角膜散光降至1.14 D（±0.67；0.11至3.89）。偏最小二乘回归显示，角膜的高偏心率、角膜曲率计与地形图之间的大偏差以及术前的高散光导致术后散光误差更大。结论。PCRI可使术前散光降低，尽管预测困难，但发现有几个因素是相关的误差来源。
