Department of Ophthalmology, Goethe-University Frankfurt am Main, Germany.
Department of Ophthalmology, Goethe-University Frankfurt am Main, Germany.
J Cataract Refract Surg. 2019 Nov;45(11):1602-1611. doi: 10.1016/j.jcrs.2019.06.010.
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.
Department of Ophthalmology, Goethe University, Frankfurt am Main, Germany.
Prospective interventional case series.
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 (CA) 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 (CA), posterior corneal astigmatism (CA), and CA. Student t and Wilcoxon tests were performed. A P value less than 0.05 was considered statistically significant.
This study comprised 53 eyes of 38 patients. At 3 months postoperatively, the CA, CA, and CA were significantly higher compared with the preoperative values (P = .015, P = .007, P = .008, respectively); however, CA and CA were significantly lower compared with the limit of 0.50 D (P < .001, P = .01, respectively), whereas CA was not (P = .11). The mean SIA of CA, CA, and CA 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).
Femtosecond laser temporal CCIs induce minimal astigmatism in CA, CA, and CA, but can be evaluated statistically as astigmatically neutral.
使用Scheimpflug 断层扫描测量评估飞秒激光辅助白内障手术后（FLACS）颞部透明角膜切口（CCI）对前、后角膜曲率产生的手术源性散光（SIA）。
德国法兰克福歌德大学眼科。
前瞻性干预性病例系列研究。
本研究纳入 2013 年 6 月至 2014 年 7 月期间接受 FLACS 的患者。所有患者术前及术后 1 个月和 3 个月均使用 Pentacam HR 进行测量，术前总角膜屈光力（TCRP）散光（CA）为 0.50 屈光度（D）或更低，且接受 0 度和 180 度的颞部 2.2mm 切口。使用 Holladay-Cravy-Koch 公式和 Alpins 方法进行向量分析，确定前角膜散光（CA）、后角膜散光（CA）和角膜散光（CA）的散光变化。采用 Student t 检验和 Wilcoxon 检验。P 值小于 0.05 为统计学显著。
本研究共纳入 38 名患者的 53 只眼。术后 3 个月，CA、CA 和 CA 与术前值相比显著升高（P=0.015、P=0.007、P=0.008）；然而，CA 和 CA 与 0.50 D 的限制值相比显著降低（P<0.001、P=0.01），而 CA 则未降低（P=0.11）。CA、CA 和 CA 的平均 SIA 分别为 0.25 D±0.15（SD）、0.16±0.11 D 和 0.28±0.17 D。误差角较高（分别为-1.98±52.95 度、1.64±51.27 度和-1.72±48.79 度）。
飞秒激光颞部 CCI 在前角膜散光（CA）、CA 和 CA 中引起的散光最小，但可统计评估为散光中性。
