PURPOSE:To compare the predictability of intraocular lens (IOL) power calculation using several corneal power measurements in eyes that underwent phototherapeutic keratectomy (PTK). STUDY DESIGN:Retrospective case series. METHODS:We reviewed the clinical charts of 42 eyes of 25 consecutive patients who underwent cataract surgery after PTK for granular corneal dystrophy or band keratopathy. IOL power calculations were performed using the SRK/T formula with four corneal power measurements [automated keratometry (AK) measured with a partial coherence interferometer, simulated keratometry (Sim K), true net power (TNP), and total corneal refractive power (TCRP) measured with a rotating Scheimpflug camera]; we determined the prediction error, absolute error, and percentage within ± 1.0 D of the targeted refraction, 1 month postoperatively. RESULTS:The prediction error in the TCRP group was significantly better than those in the AK, Sim K, and TNP groups. The absolute error was also significantly better than those in the AK and Sim K groups, but not significantly different from that in the TNP group. The percentages of within ± 0.5 and 1.0 D in the TCRP group were significantly higher than those in the AK and Sim K groups, but not significantly different from that in the TNP group. CONCLUSIONS:The TCRP provides the highest predictability of IOL power calculation in post-PTK eyes. This result suggests that the use of the TCRP, rather than of conventional anterior keratometry, may be clinically helpful for improving the refractive accuracy of post-PTK eyes.

译文

目的:比较在接受光疗性角膜切除术(PTK)的眼睛中使用几种角膜屈光度测量值计算的人工晶状体(IOL)屈光度的可预测性。
研究设计:回顾性病例系列。
方法:我们回顾了25例接受PTK治疗颗粒状角膜营养不良或带状角膜病变的白内障手术的连续42眼患者的临床图表。使用SRK / T公式进行IOL屈光度计算,并进行四次角膜屈光度测量[使用部分相干干涉仪测量的自动角膜屈光度(AK),模拟角膜屈光度(Sim K),真实净屈光度(TNP)和总角膜屈光度(TCRP) )用旋转的Scheimpflug相机测量];我们确定了术后1个​​月的目标屈光度的±1.0 D以内的预测误差,绝对误差和百分比。
结果:TCRP组的预测误差明显优于AK,Sim K和TNP组。绝对误差也显着优于AK和Sim K组,但与TNP组无显着差异。 TCRP组内±0.5和1.0 D以内的百分比显着高于AK和Sim K组,但与TNP组无显着差异。
结论:TCRP在PTK后的眼睛中提供了最高的IOL功率计算可预测性。该结果表明,使用TCRP代替传统的前角膜测量法可能在临床上有助于改善PTK后眼睛的屈光准确度。

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