Repeatability of corneal power and wavefront aberration measurements with a dual-Scheimpflug Placido corneal topographer
Repeatability of corneal power and wavefront aberration measurements with a dual-Scheimpflug Placido corneal topographer
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DOI：
10.1016/j.jcrs.2009.09.034
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发表时间：
2010-03-01
影响因子：
2.8
通讯作者：
Koch, Douglas D.
中科院分区：
文献类型：
--
作者：
Wang, Li;Shirayama, Mariko;Koch, Douglas D.
目得：评价Galilei双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）方面的可重复性。单位：美国德克萨斯州休斯顿贝勒医学院卡伦眼科研究所。方法：对每位受试者的1只眼睛进行3次连续测量。评价了以下内容：（1）中央、旁中央和周边区的平均总角膜屈光力（分别为0.0 - 4.0 mm、4.0 - 7.0 mm和7.0 - 8.0 mm）和后角膜屈光力（K（avg））;（2）角膜高阶波前像差（6.0 mm瞳孔）;（3）中央、旁中央和周边区的平均角膜厚度测量;和（4）ACD。通过计算受试者内标准差（SD）、变异系数（COV）和组内相关系数（ICC）评估重复性。中央、旁中央和周边总角膜屈光力的SD分别为0.09屈光度（D）、0.05 D和0.19 D，后K（平均值）的SD为0.03 D。COV在0.10%~ 0.35%之间，ICC大于0.996（P
PURPOSE: To evaluate the repeatability of the Galilei dual-Scheimpflug analyzer in measuring corneal curvature, wavefront aberrations, pachymetry, and anterior chamber depth (ACD).SETTING: Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.METHODS: 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).RESULTS: 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