Pentacam AXL和IOLMaster 500测量白内障术后人工晶状体眼生物参数的比较

目的 比较Pentacam AXL及IOLMaster 500测量白内障术后人工.晶状体(IOL)眼生物参数的差异。设计 前瞻性病例系列。研究对象 2021年10月北京同仁医院白内障术后IOL眼患者69例(69眼)。方法 对患眼先后应用Pentacam AXL及IOLMaster 500测量眼轴长度(AL)、角膜曲率(K1、K2及Km)、前房深度(ACD)及角膜横径(WTW),不同仪器测量结果 进行配对t检验及一致性检验,并应用MedCalc软件对两组数据进行Bland-Altman分析。主要指标 AL,K1、K2及Km,ACD及WTW值,组内相关系数(ICC)值,Bland-Altman图的95%一致性界限及95%一致性界限以外的点。结果 Pentacam AXL和IOLMaster 500测量69例(69眼)IOL眼的AL分别为(23.57±1.18)mm、(23.58±1.18)mm,K1分别为(43.57±2.02)D、(43.65±2.09)D(P均>0.05);而Pentacam AXL测得K2为(44.55±2.04)D,Km为(44.06±2.01)D,WTW为(...

Comparison of Pentacam AXL and IOLMaster 500 for measuring the parameters of pseudophakic eyes

 Objective To compare the difference between two optical biometric instruments Pentacam AXL and IOLMaster 500 for measuring the parameters of pseudophakic eyes. Design Prospective cases series. Participants 69 cases (69 eyes) of pseudophakic eyes were selected in October 2021 in Beijing Tongren Hospital. Methods The axial length (AL), keratometry (K1, K2 and Km), anterior chamber depth ACD) and white to white  (WTW) corneal diameter were measured by Pentacam AXL and IOLMaster 500 successively. The results of two groups were tested by paired t test and reliability analysis, and MedCalc software was used to do the Bland-Altman analysis. Main Outcome Measures AL, K1, K2, Km, ACD, WTW, intraclass correlation coefficient(ICC) value, 95% consistency limit of Bland-Altman diagram and points outside the 95% consistency limit. Results AL measured by Pentacam AXL and IOLMaster 500 was (23.57±1.18) mm, (23.58±1.18) mm respectively and K1 was (43.57±2.02) D, (43.65±2.09) D respectively (all P>0.05). The K2 was (44.55±2.04) D, Km was (44.06±2.01) D and WTW was (11.25±0.37) mm measured by Pentacam AXL, which were less than (44.80±2.07) D, (44.23±2.05) D and (11.48±0.38) mm measured by IOLMaster 500 (all P<0.001). ACD (4.14±0.82) mm measured by Pentacam AXL was greater than (3.82±0.59) mm of IOLMaster 500 (t=2.274, P=0.041). The ICC values of AL, K1, K2, and Km were all close to 1 (0.999, 0.990, 0.994, and 0.996 respectively). The 95% consistency limit of Bland-Altman analysis was also close, AL (-0.1345, 0.1039) mm, K1 (-0.9013, 0.7291) D, K2 (-0.8627, 0.3622) D, Km (-0.6815, 0.3451) D, ACD (-0.7055, 1.3397) mm, WTW (-0.7092, 0.2499) mm. Only the points of AL 3.28% (2/61), K1 5.78% (4/69), K2 7.25% (5/69), Km 5.78% (4/69), ACD 0 (0/14) and WTW 5.56% (3/54) were outside the 95% consistency limit. Conclusion There are some differences in axial length, keratometry, anterior chamber depth and white to white of pseudophakic eyes between Pentacam AXL and IOLMaster 500. Measurement results cannot be used instead of each other. （Ophthalmol CHN, 2022, 31: 118-122）