双眼与单眼 Scheimpflug 相机在前节分析中的比较：精确性和一致性。
Dual versus single Scheimpflug camera for anterior segment analysis: Precision and agreement.
机构信息
Begitek Clínica Oftalmológica, San Sebastián, Spain.
出版信息
J Cataract Refract Surg. 2012 Nov;38(11):1934-49. doi: 10.1016/j.jcrs.2012.06.049. Epub 2012 Sep 18.
PURPOSE
To assess the repeatability, reproducibility, and agreement of the Pentacam HR single-camera and Galilei G2 dual-camera Scheimpflug devices in anterior segment analysis.
SETTING
Begitek Clínica Oftalmológica, San Sebastián, Spain.
DESIGN
Prospective randomized observational study.
METHODS
Healthy young individuals had 3 consecutive tests by 2 examiners. Analyzed parameters were anterior and posterior cornea simulated keratometry (K), K flat, K steep, astigmatism magnitude and axis, J(0) and J(45) vectors, asphericity, total corneal higher-order wavefront aberrations (root mean square [RMS], coma, trefoil, spherical aberration), central cornea and thinnest-point thicknesses, and anterior chamber depth. Repeatability and reproducibility were evaluated by calculating the within-subject standard deviation (S(w)), some derived coefficients, and the intraclass correlation coefficient. Agreement was assessed with the Bland-Altman method.
RESULTS
The single-camera device reproducibility (S(w)) was simulated K, 0.04 diopter (D); J(0), 0.03 D; J(45), 0.04 D; total power, 0.04 D; spherical aberration, 0.02 μm; higher-order aberrations (HOAs), 0.02 μm; central corneal thickness (CCT), 3.39 μm. The dual-camera device S(w) was simulated K, 0.07 D; J(0), 0.13 D; J(45), 0.04 D; total power, 0.08 D; spherical aberration, 0.02 μm; HOAs, 0.11 μm; CCT, 1.36 μm. Agreement was good for most parameters except total corneal power (mean difference 1.58 D ± 0.22 (SD) and HOA RMS (mean difference 0.48 ± 0.19 μm) (both P<.00).
CONCLUSIONS
Repeatability and reproducibility were good for all parameters. The single-camera device was more precise for curvature, astigmatism, and corneal wavefront error measurements and the dual-camera device for pachymetry measurements. Agreement was good with some relevant exceptions.
FINANCIAL DISCLOSURE
Dr. Aramberri is consultant to Costruzione Strumenti Oftalmici, Firenze, Italy. No other author has a financial or proprietary interest in any material or method mentioned.
目的
评估 Pentacam HR 单相机和 Galilei G2 双相机 Scheimpflug 设备在前节分析中的重复性、可再现性和一致性。
地点
西班牙圣塞巴斯蒂安的 Begitek Clínica Oftalmológica。
设计
前瞻性随机观察性研究。
方法
健康的年轻个体由 2 名检查者进行 3 次连续测试。分析的参数包括前、后角膜模拟角膜曲率（K）、K 平坦度、K 陡峭度、散光大小和轴、J(0)和 J(45)矢量、非球面性、总角膜高阶波前像差（均方根[RMS]、彗差、三叶差、球差）、中央角膜和最薄点厚度以及前房深度。通过计算受试者内标准差（S(w)）、一些衍生系数和组内相关系数来评估重复性和可再现性。使用 Bland-Altman 方法评估一致性。
结果
单相机设备的可重复性（S(w)）为模拟 K，0.04 屈光度（D）；J(0)，0.03 D；J(45)，0.04 D；总功率，0.04 D；球差，0.02 μm；高阶像差（HOAs），0.02 μm；中央角膜厚度（CCT），3.39 μm。双相机设备的 S(w)为模拟 K，0.07 D；J(0)，0.13 D；J(45)，0.04 D；总功率，0.08 D；球差，0.02 μm；HOAs，0.11 μm；CCT，1.36 μm。除了总角膜力（平均差值 1.58 D ± 0.22（标准差）和 HOAs RMS（平均差值 0.48 ± 0.19 μm）（均 P<.00）外，大多数参数的一致性都很好。
结论
所有参数的重复性和可再现性都很好。单相机设备在曲率、散光和角膜波前误差测量方面更精确，而双相机设备在角膜厚度测量方面更精确。一致性很好，但存在一些相关的例外。
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