PURPOSE To evaluate surgically induced astigmatism (SIA) of temporal clear corneal incisions (CCIs) on anterior and posterior corneal curvature after femtosecond laser-assisted cataract surgery (FLACS) using Scheimpflug tomographic measurements. SETTING Department of Ophthalmology, Goethe University, Frankfurt am Main, Germany. DESIGN Prospective interventional case series. METHODS This study enrolled patients who underwent FLACS from June 2013 to July 2014. All eyes were measured with a Pentacam HR preoperatively and at 1 month and 3 months postoperatively, had preoperative total corneal refractive power (TCRP) astigmatism (CATCRP) of 0.50 diopters (D) or less, and received a temporal 2.2 mm incision at 0 degrees and 180 degrees. Vector analysis, using the Holladay-Cravy-Koch formula and the Alpins method, determined astigmatic changes in anterior corneal astigmatism (CAant), posterior corneal astigmatism (CApost), and CATCRP. Student t and Wilcoxon tests were performed. A P value less than 0.05 was considered statistically significant. RESULTS This study comprised 53 eyes of 38 patients. At 3 months postoperatively, the CAant, CApost, and CATCRP were significantly higher compared with the preoperative values (P = .015, P = .007, P = .008, respectively); however, CApost and CATCRP were significantly lower compared with the limit of 0.50 D (P < .001, P = .01, respectively), whereas CAant was not (P = .11). The mean SIA of CAant, CApost, and CATCRP was 0.25 D ± 0.15 (SD), 0.16 ± 0.11 D, and 0.28 ± 0.17 D, respectively. The angle of error was high (-1.98 ± 52.95 degrees, 1.64 ± 51.27 degrees, and -1.72 ± 48.79 degrees, respectively). CONCLUSION Femtosecond laser temporal CCIs induce minimal astigmatism in CAant, CApost, and CATCRP, but can be evaluated statistically as astigmatically neutral.

中文翻译：

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飞秒激光辅助白内障手术在2.2毫米颞透明角膜切口后通过手术引起的散光的层析成像分析

目的评估飞秒激光辅助性白内障手术（FLACS）后使用Scheimpflug断层扫描测量的时间上透明角膜切口（CCI）的角膜前缘和后角的手术诱发散光（SIA）。设置地点：德国美因河畔法兰克福歌德大学眼科。设计预期的介入病例系列。方法该研究纳入了从2013年6月至2014年7月接受FLACS手术的患者。术前，术后1个月和术后3个月使用Pentacam HR测量所有眼睛的术前总角膜屈光力（TCRP）散光（CATCRP）为0.50屈光度（ D）或更小，并在0度和180度接受了2.2毫米的颞侧切口。使用Holladay-Cravy-Koch公式和Alpins方法进行矢量分析，确定角膜前散光（CAant），角膜后散光（CApost）和CATCRP的散光变化。进行了学生t和Wilcoxon测试。小于0.05的AP值被认为具有统计学意义。结果该研究包括38例患者的53只眼。术后3个月，CAant，CApost和CATCRP明显高于术前值（分别为P = .015，P = .007，P = .008）。但是，CApost和CATCRP显着低于0.50 D的限值（分别为P <.001，P = .01），而CAant没有（P = .11）。CAant，CApost和CATCRP的平均SIA分别为0.25 D±0.15（SD），0.16±0.11 D和0.28±0.17D。误差角很高（分别为-1.98±52.95度，1.64±51.27度和-1.72±48.79度）。