Reliability and repeatability of the Pentacam on corneal curvatures
Reliability and repeatability of the Pentacam on corneal curvatures
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DOI：
10.1111/j.1444-0938.2008.00336.x
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发表时间：
2009-03-01
影响因子：
1.9
通讯作者：
Lam, Andrew K. C.
中科院分区：
文献类型：
--
作者：
Chen, Davie;Lam, Andrew K. C.
本研究旨在评估Pentacam系统（Oculus，Inc.）从香港理工大学视光学学院的39名正常受试者中随机抽取一只眼，用模拟角膜曲率计（Sim K）和角膜前后表面的周边角膜曲率（PCC）测量角膜曲率。在第一次会议上，三个读数进行可靠性分析。在一至两周后安排的第二次会议中重复测量，以进行重复性分析。使用了两种方法，比较两次会议之间的第一次阅读和比较两次会议之间的三次阅读的平均值。根据切线和轴向图计算前部和后部Sim K和PCC。阶段间重复性报告为重复性系数（COR =+/-1.96 x差异标准差）。相对重复性（RR）是COR与平均值的比值，所有参数均显示出良好的观察者内可靠性（Cronbach α>= 0.925;类内相关系数，ICC>= 0.804），后验功率向量J45除外（= 0.896; ICC = 0.742）和上级区域的切线PCC（= 0.891; ICC = 0.732）。前Sim K（COR）的会话间重复性
The purpose of this study was to assess the intra-observer reliability and inter-session repeatability of the Pentacam system (Oculus, Inc.) on the simulated keratometry readings (Sim K) and peripheral corneal curvatures (PCC) at both the anterior and posterior corneal surfaces.One eye was randomly selected from each of the 39 normal subjects from the School of Optometry at The Hong Kong Polytechnic University. In the first session, three readings were taken for reliability analysis. Measurements were repeated in a second session scheduled one to two weeks later for repeatability analysis. Two approaches were used, comparing the first reading between the two sessions and comparing the average from three readings between the two sessions. Both the anterior and posterior Sim K and PCC were calculated from the tangential and axial maps. The inter-session repeatability was reported as the coefficient of repeatability (COR = +/- 1.96 x standard deviation of differences). Relative repeatability (RR) was a percentage of the ratio of COR to the mean.All parameters showed good intra-observer reliability (Cronbach's alpha >= 0.925; intra-class correlation coefficient, ICC >= 0.804), except for the posterior power vector J45 (= 0.896; ICC = 0.742) and tangential PCC at the superior region (= 0.891; ICC = 0.732). The inter-session repeatability on anterior Sim K (COR