Purpose. To evaluate surgically induced astigmatism (SIA) and the average corneal power change in symmetric intrastromal corneal ring segment (ICRS) implantation. Methods. The study included 34 eyes of 34 keratoconus patients who underwent symmetric Intacs SK ICRS implantation. The corneal pocket incision meridian was the preoperative steep meridian. Corneal power data were obtained before and 3 months after Intacs SK ICRS implantation using scanning-slit topography. Polar value analysis was used to evaluate the SIA. Hotelling's trace test was used to compare intraindividual changes. Results. Three months postoperatively, the combined mean polar value for SIA changed significantly (Hotelling's T 2 = 0.375; P = 0.006). The SIA was 1.54 D at 99° and the average corneal power decreased significantly by 3.8 D. Conclusion. Intacs SK ICRS placement decreased the average corneal power and corneal astigmatism compared to the preoperative corneal power and astigmatism when the corneal pocket incision was made at the preoperative steep meridian.
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机译：目的。为了评估手术引起的散光（SIA）和对称基质内角膜环节段（ICRS）植入中的平均角膜屈光度变化。方法。该研究纳入了34例接受对称Intacs SK ICRS植入术的圆锥角膜患者的34只眼。角膜口袋切口子午线是术前陡峭的子午线。使用扫描狭缝形貌在Intacs SK ICRS植入之前和之后3个月获得角膜屈光力数据。极值分析用于评估SIA。使用Hotelling的跟踪测试来比较个体差异。结果。术后三个月，SIA的综合平均极值发生了显着变化（Hotelling的T 2 = 0.375； P = 0.006）。在99°时SIA为1.54 D，平均角膜屈光力明显降低了3.8D。与在术前陡峭子午线进行角膜袋切口时相比，与术前角膜屈光度和散光相比，Intacs SK ICRS放置可降低平均角膜屈光度和角膜散光。
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