Wang Z Y, Yang W L, Song Y Z, Li D J, Chen W, Zhao Q, Li Y F, Cui R, Shen L, Liu Q, Wei C C, Zhai C B
Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China.
Zhonghua Yan Ke Za Zhi. 2023 Jun 11;59(6):460-466. doi: 10.3760/cma.j.cn112142-20220707-00330.
To compare the accuracy of different corneal curvature parameters in assessing the corneal refractive status and tracking corneal power changes after small incision lenticule extraction (SMILE). This prospective cross-sectional study tracked and recorded total corneal curvature parameters measured by different instruments before and three months after SMILE for myopia. These parameters, including total keratometry (TK) from the IOLMaster 700, total corneal refractive power (TCRP) from the Pentacam AXL, real keratometry (RK) from the CASIA 2, and corrected parameters calculated using the Haigis, Shammas, and Maloney methods, were compared with data obtained using the clinical history method (CHM). Surgically induced changes in TK, TCRP, and RK were analyzed and compared with those in spherical equivalent on the corneal plane (ΔSEco). The study included 40 eyes (40 participants). After SMILE, the difference was smallest between TK [(0.08±0.38) D] and CHM values (>0.05). However, TCRP, RK, K, K, and K were significantly different from CHM data (<0.05). The width of the 95% limits of agreement of TK (1.49 D) was narrowest, followed by that of RK (1.57 D). Pearson analysis showed that each parameter had a good correlation with CHM data. The differences between the changes in TK, TCRP and RK caused by surgery and ΔSEco were (0.03±0.39) D, (0.17±0.43) D, and (-0.19±0.46) D, respectively. The width of the 95% limits of agreement of ΔTK (1.54 D) was narrowest, and the correlation coefficient of ΔTK (0.951) was highest. The parameter TK of the IOLMaster 700 can provide accurate and objective corneal power evaluation after SMILE.
比较不同角膜曲率参数在评估小切口透镜切除术（SMILE）后角膜屈光状态及追踪角膜屈光力变化方面的准确性。这项前瞻性横断面研究对近视患者在SMILE术前及术后三个月使用不同仪器测量的总角膜曲率参数进行了追踪和记录。这些参数包括IOLMaster 700测量的总角膜曲率（TK）、Pentacam AXL测量的总角膜屈光力（TCRP）、CASIA 2测量的实际角膜曲率（RK）以及使用海吉斯、沙马斯和马洛尼方法计算的校正参数，并与临床病史法（CHM）获得的数据进行比较。分析手术引起的TK、TCRP和RK的变化，并与角膜平面等效球镜度（ΔSEco）的变化进行比较。该研究纳入了40只眼（40名参与者）。SMILE术后，TK与CHM值之间的差异最小[（0.08±0.38）D]（>0.05）。然而，TCRP、RK、K、K和K与CHM数据存在显著差异（<0.05）。TK一致性界限95%的宽度（1.49 D）最窄，其次是RK（1.57 D）。Pearson分析表明，各参数与CHM数据具有良好相关性。手术引起的TK、TCRP和RK变化与ΔSEco之间的差异分别为（0.03±0.39）D、（0.17±0.43）D和（-0.19±0.46）D。ΔTK一致性界限95%的宽度（1.54 D）最窄，ΔTK的相关系数（0.951）最高。IOLMaster 700的TK参数可在SMILE术后提供准确客观的角膜屈光力评估。
