Lauschke Jenny L, Lawless Michael, Sutton Gerard, Roberts Timothy V, Hodge Christopher
Vision Eye Institute Chatswood, Sydney, New South Wales, Australia.
Department of Ophthalmology, Prince of Wales Hospital, Sydney, New South Wales, Australia.
Clin Exp Ophthalmol. 2016 Jul;44(5):369-76. doi: 10.1111/ceo.12687. Epub 2016 Feb 20.
Keratometry is a critical determinant of the postoperative refractive outcome. This study evaluates the comparability of keratometry measurements obtained using the Verion Optical Imaging System with devices used in current clinical practice. Further, it determines the interobserver reliability of the Verion Optical Imaging System.
Retrospective analysis of patient data
Keratometric data was obtained from 100 patients presenting for pre-operative evaluation. Furthermore, repeatability and reproducibility were assessed using 15 healthy volunteers.
Corneal curvature values acquired by the Verion Optical Imaging System were compared with existing keratometry devices including autokeratometry, partial coherence interferometry (IOLMaster) and Scheimpflug corneal topography (Pentacam).
Direct comparison of corneal power, cylinder, axis of astigmatism and vector analysis were performed using correlation and Bland-Altman analyses. Reproducibility and reliability of the device were assessed using within-subject standard deviation and intraclass correlation coefficients for experienced and inexperienced technicians.
There was no statistically significant difference between Verion values and those obtained by other methods in relation to mean keratometry, corneal astigmatism, steep meridian and vector analyses (P > 0.05). Bland-Altman plots showed narrow limits of agreement for keratometry and astigmatism and wider agreement for steep meridian. Intraoperator reliability for both experienced and inexperienced operators and interoperator reproducibility showed no statistically significant differences between values.
Measurements show no significant difference from those obtained by the other devices. This suggests the Verion system is en par with instruments used in current clinical practice. The Verion Optical Imaging System produces repeatable data with no difference related to operator experience.
角膜曲率测量是术后屈光结果的关键决定因素。本研究评估了使用Verion光学成像系统获得的角膜曲率测量值与当前临床实践中使用的设备的可比性。此外，还确定了Verion光学成像系统的观察者间可靠性。
对患者数据进行回顾性分析
从100名接受术前评估的患者中获取角膜曲率数据。此外，使用15名健康志愿者评估重复性和再现性。
将Verion光学成像系统获取的角膜曲率值与现有的角膜曲率测量设备进行比较，包括自动角膜曲率计、部分相干干涉测量法（IOLMaster）和Scheimpflug角膜地形图仪（Pentacam）。
使用相关性分析和Bland-Altman分析对角膜屈光力、柱镜、散光轴和矢量分析进行直接比较。使用受试者内标准差和组内相关系数对经验丰富和经验不足的技术人员评估设备的再现性和可靠性。
在平均角膜曲率、角膜散光、陡峭子午线和矢量分析方面，Verion测量值与其他方法获得的值之间无统计学显著差异（P> 0.05）。Bland-Altman图显示角膜曲率和散光的一致性界限较窄，陡峭子午线的一致性较宽。经验丰富和经验不足的操作员的操作者内可靠性以及操作员间再现性在测量值之间无统计学显著差异。
测量结果与其他设备获得的结果无显著差异。这表明Verion系统与当前临床实践中使用的仪器相当。Verion光学成像系统产生可重复的数据，且与操作员经验无关。
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