Barkana Yaniv, Gerber Yariv, Elbaz Uri, Schwartz Shulamit, Ken-Dror Gie, Avni Isaac, Zadok David
Department of Ophthalmology, Assaf Harofe Medical Center, Beer Yaacov, Zerifin, Israel.
J Cataract Refract Surg. 2005 Sep;31(9):1729-35. doi: 10.1016/j.jcrs.2005.03.058.
To assess the intraoperator repeatability and interoperator reproducibility of central corneal thickness measurements by the Pentacam Scheimpflug imaging system (Oculus) and the optical low-coherence reflectometer (OLCR) pachymeter (Haag-Streit) and to compare them with those of ultrasound (US) pachymetry.
Assaf Harofe Medical Center Ophthalmology Outpatient Clinic, Zerifin, Israel.
Repeatability was determined from 10 successive measurements in each of 4 healthy patients. Reproducibility for the Pentacam Scheimpflug system was determined from measurements by 2 operators in each of 24 patients; in these 24 patients, central corneal thickness measurements were compared between the Pentacam and US pachymetry. For the OLCR pachymeter, reproducibility was determined from measurements by 2 operators in each of 16 patients, in whom central corneal thickness was also measured with the Pentacam.
Mean coefficient of repeatability was 0.84% for the Pentacam Scheimpflug system and 0.33% for the OLCR pachymeter. For the Pentacam, the coefficient of interoperator reproducibility was 1.10% and the 95% limits of agreement were -10.2 microm to +11.9 microm. Mean difference between Pentacam and US was 6.09 microm. For the OLCR pachymeter, the coefficient of interoperator reproducibility was 0.59% and the 95% limits of agreement were -5.4 microm to +7.0 microm. Mean difference between central corneal thickness values obtained with the OLCR pachymeter and Pentacam Scheimpflug system was 1.7 microm.
Objective, noncontact measurement of central corneal thickness with the Pentacam Scheimpflug system and OLCR pachymeter was convenient and yielded excellent intraoperator repeatability and interoperator reproducibility. Central corneal thickness values obtained with the Pentacam were similar to those obtained with both the OLCR pachymeter and an US pachymeter. Further research is needed to corroborate whether central corneal thickness measurements by the Pentacam and OLCR devices can be used interchangeably and are more clinically useful than US pachymetry.
评估Pentacam眼前节分析系统（Oculus）和光学低相干反射仪（OLCR）测厚仪（Haag-Streit）测量中央角膜厚度的操作者内重复性和操作者间再现性，并与超声（US）测厚法进行比较。
以色列泽里芬阿萨夫·哈罗菲医疗中心眼科门诊。
对4名健康患者每人进行10次连续测量以确定重复性。Pentacam眼前节系统的再现性由2名操作者对24名患者进行测量来确定；在这24名患者中，比较Pentacam和US测厚法测量的中央角膜厚度。对于OLCR测厚仪，再现性由2名操作者对16名患者进行测量来确定，这些患者也用Pentacam测量中央角膜厚度。
Pentacam眼前节系统的平均重复性系数为0.84%，OLCR测厚仪为0.33%。对于Pentacam，操作者间再现性系数为1.10%，95%一致性界限为-10.2微米至+11.9微米。Pentacam与US的平均差值为6.09微米。对于OLCR测厚仪，操作者间再现性系数为0.59%，95%一致性界限为-5.4微米至+7.0微米。OLCR测厚仪和Pentacam眼前节系统测得的中央角膜厚度值的平均差值为1.7微米。
使用Pentacam眼前节系统和OLCR测厚仪对中央角膜厚度进行客观、非接触测量方便快捷，具有出色的操作者内重复性和操作者间再现性。Pentacam测得的中央角膜厚度值与OLCR测厚仪和US测厚法测得的值相似。需要进一步研究以证实Pentacam和OLCR设备测量的中央角膜厚度是否可互换使用，以及是否比US测厚法在临床上更有用。
