Institute of Vision Research, Yonsei University College of Medicine, Seoul, South Korea.
J Cataract Refract Surg. 2012 Sep;38(9):1608-15. doi: 10.1016/j.jcrs.2012.04.035. Epub 2012 Jul 15.
To compare the corneal astigmatism measurements from 6 instruments in preoperative assessment for toric intraocular lens (IOL) implantation.
Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea.
Prospective comparative observational study.
This study included patients with cataract and more than 1.00 diopter (D) of corneal astigmatism. For preoperative evaluation of toric IOL implantation, the net astigmatism was evaluated using manual keratometry, autokeratometry, partial coherence interferometry (PCI) (IOLMaster), corneal topography/ray-tracing aberrometry (iTrace), scanning-slit topography (Orbscan), and Scheimpflug imaging (Pentacam). All net astigmatisms were converted to polar values. Using the astigmatism measurements from manual keratometry as a standard, Bland-Altman analysis, linear mixed-model, and bivariate graphic analysis were performed.
The study group comprised 257 eyes of 141 patients. Bland-Altman plots showed good agreement between manual keratometry and each instrument for polar values. There was no significant between-instrument difference in KP(90) and KP(135) in the linear mixed model analysis or in bivariate polar values in bivariate confidence ellipses.
The corneal astigmatism measurements from autokeratometry, PCI, corneal topography/ray-tracing aberrometry, scanning-slit topography, and Scheimpflug imaging were comparable to those from manual keratometry and can be used interchangeably with manual keratometry to measure corneal astigmatism.
比较 6 种仪器在用于测量拟植入散光人工晶状体(IOL)的角膜散光时的测量结果。
韩国延世大学医学院眼科视觉研究所。
前瞻性比较观察性研究。
本研究纳入了伴有白内障且角膜散光大于 1.00 屈光度(D)的患者。在进行散光 IOL 植入术前评估时,采用手动角膜曲率计、自动角膜曲率计、部分相干干涉测量法(IOLMaster)、角膜地形图/光线追踪像差仪(iTrace)、扫描-slit 角膜地形图(Orbscan)和Scheimpflug 成像仪(Pentacam)来评估总散光。所有的总散光均转换为极坐标值。以手动角膜曲率计的散光测量值为标准,进行 Bland-Altman 分析、线性混合模型分析和双变量图形分析。
研究组包括 141 例患者的 257 只眼。Bland-Altman 图显示,在极坐标值方面,手动角膜曲率计与其他各仪器之间具有良好的一致性。线性混合模型分析或双变量极坐标值的双变量置信椭圆分析均未显示在 KP(90)和 KP(135)方面存在仪器间差异。
自动角膜曲率计、PCI、角膜地形图/光线追踪像差仪、扫描-slit 角膜地形图和 Scheimpflug 成像仪的角膜散光测量值与手动角膜曲率计的测量值具有可比性,可以与手动角膜曲率计互换使用,以测量角膜散光。