Salouti Ramin, Nowroozzadeh Mohammad Hossein, Tajbakhsh Zahra, Bagheri Mansoureh, Ghoreyshi Maryam, Azizzadeh Monir, Razeghinejad Mohammad Reza
*Department of Opthalmology, Poostchi Eye Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; †Salouti Eye Clinic, Salouti Cornea Research Center, Shiraz, Iran; ‡Health Policy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; and §Glaucoma Service, Wills Eye Institute, Philadelphia, PA, USA.
Cornea. 2017 Nov;36(11):1373-1376. doi: 10.1097/ICO.0000000000001300.
To assess the agreement between a swept-source optical biometry device (IOLMaster 700) and a Scheimpflug-based topography device (Pentacam HR) in measuring the corneal diameter.
A total of 100 eyes from 100 cataract surgery candidates were enrolled. The white-to-white (WTW) distance measurements provided by both devices were recorded and analyzed. A paired t test was performed to compare the mean values of the WTW distance between the IOLMaster 700 and Pentacam HR. The Bland-Altman analysis was used to evaluate the agreement between the measurements of both devices.
Mean age (±SD) of the participants was 65.9 ± 3.3 years, and 58 (58%) were men. The mean WTW distances measured by the IOLMaster 700 and Pentacam HR were 11.72 ± 0.45 mm and 11.41 ± 0.42 mm, respectively (P < 0.001). The overall 95% limits of agreement were -0.17 and 0.78 mm. The 95% limits of agreement between the measurements of the 2 devices were -0.30 and 0.84 versus -0.07 and 0.72 for eyes with WTW distances of ≤11.50 mm versus >11.50 mm, respectively.
According to the results of this study, the IOLMaster 700 may overestimate the WTW distance measurements by up to 0.78 mm compared with the Pentacam HR, so these 2 devices should not be used interchangeably for this purpose. The agreement is somehow weaker for eyes with WTW distances of 11.50 mm or less than those with WTW distances greater than 11.50 mm.
评估扫频源光学生物测量仪（IOLMaster 700）与基于Scheimpflug原理的眼前节分析仪（Pentacam HR）在测量角膜直径方面的一致性。
纳入100例白内障手术候选者的100只眼睛。记录并分析两种设备提供的白对白（WTW）距离测量值。采用配对t检验比较IOLMaster 700与Pentacam HR测量的WTW距离平均值。使用Bland-Altman分析评估两种设备测量结果之间的一致性。
参与者的平均年龄（±标准差）为65.9±3.3岁，其中58例（58%）为男性。IOLMaster 700和Pentacam HR测量的平均WTW距离分别为11.72±0.45mm和11.41±0.42mm（P<0.001）。总体95%一致性界限为-0.17和0.78mm。对于WTW距离≤11.50mm与>11.50mm的眼睛，两种设备测量结果的95%一致性界限分别为-0.30和0.84以及-0.07和0.72。
根据本研究结果，与Pentacam HR相比，IOLMaster 700测量的WTW距离可能高估多达0.78mm，因此这两种设备在此用途上不应互换使用。对于WTW距离为11.50mm或更小的眼睛，一致性比WTW距离大于11.50mm的眼睛稍差。
