Department of Ophthalmology, Baylor College of Medicine, Houston, Texas 77030, USA.
J Cataract Refract Surg. 2010 Mar;36(3):425-30. doi: 10.1016/j.jcrs.2009.09.034.
To evaluate the repeatability of the Galilei dual-Scheimpflug analyzer in measuring corneal curvature, wavefront aberrations, pachymetry, and anterior chamber depth (ACD).
Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.
Three consecutive measurements were performed in 1 eye of each subject. The following were evaluated: (1) mean total corneal power at the central, paracentral, and peripheral zones (0.0 to 4.0 mm, 4.0 to 7.0 mm, and 7.0 to 8.0 mm, respectively) and posterior corneal power (K(avg)); (2) corneal higher-order wavefront aberrations (6.0 mm pupil); (3) mean pachymetry at the central, paracentral, and peripheral zones; and (4) ACD. Repeatability was assessed by calculating the within-subject standard deviation (SD), coefficient of variation (COV), and intraclass correlation coefficient (ICC).
The study enrolled 20 subjects. The SD was 0.09 diopter (D), 0.05 D, and 0.19 D for central, paracentral, and peripheral total corneal power, respectively, and 0.03 D for posterior K(avg). The COV ranged from 0.10% to 0.35%, and the ICC was 0.996 or more (P<.001). For 3rd-order coma and trefoil, the SD was 0.08 mum and 0.09 mum, respectively. For 4th-order spherical aberration, astigmatism, and tetrafoil, the SDs were lower (0.02 mum, 0.04 mum, and 0.09 mum, respectively). The SD was 1.68 mum, 1.98 mum, and 2.82 mum for central, paracentral, and peripheral pachymetry, respectively, and 0.04 mm for ACD.
Dual-Scheimpflug measurements of corneal power, pachymetry, ACD, and corneal aberrations for Zernike terms in the middle of the Zernike tree showed excellent repeatability.
评估 Galilei 双重 Scheimpflug 分析仪在测量角膜曲率、波前像差、角膜厚度和前房深度（ACD）方面的重复性。
美国德克萨斯州休斯顿贝勒医学院 Cullen 眼科研究所。
对每个受试者的一只眼进行 3 次连续测量。评估以下内容：（1）中央、旁中央和周边区域（分别为 0.0 至 4.0mm、4.0 至 7.0mm 和 7.0 至 8.0mm）和后角膜曲率（K（avg））的总角膜功率平均值；（2）角膜高阶波前像差（6.0mm 瞳孔）；（3）中央、旁中央和周边区域的平均角膜厚度；（4）ACD。通过计算个体内标准差（SD）、变异系数（COV）和组内相关系数（ICC）来评估重复性。
本研究纳入 20 名受试者。中央、旁中央和周边总角膜功率的 SD 分别为 0.09 屈光度（D）、0.05 D 和 0.19 D，后 K（avg）的 SD 为 0.03 D。COV 范围为 0.10%至 0.35%，ICC 均在 0.996 或以上（P<.001）。三阶彗差和三叶形的 SD 分别为 0.08 µm 和 0.09 µm。四阶球差、散光和四叶形的 SD 较低（分别为 0.02 µm、0.04 µm 和 0.09 µm）。中央、旁中央和周边角膜厚度的 SD 分别为 1.68 µm、1.98 µm 和 2.82 µm，ACD 的 SD 为 0.04mm。
Zernike 树中部的角膜功率、角膜厚度、ACD 和角膜像差的双重 Scheimpflug 测量显示出极好的重复性。
