Cerviño Alejandro, Dominguez-Vicent Alberto, Ferrer-Blasco Teresa, García-Lázaro Santiago, Albarrán-Diego Cesar
From the Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain.
From the Optometry Research Group, Optics Department, University of Valencia, Valencia, Spain.
J Cataract Refract Surg. 2015 Jan;41(1):186-92. doi: 10.1016/j.jcrs.2014.04.037. Epub 2014 Nov 18.
To determine the intrasubject repeatability of a recently introduced dual-camera rotating Scheimpflug-Placido imaging system (Galilei G4) in determining corneal thickness, power, and wavefront aberrations in young healthy subjects.
University of Valencia, Valencia, Spain.
Prospective evaluation of diagnostic technology.
The study comprised right eyes of 25 subjects aged 20 to 40 years with a spherical equivalent ranging from -4.25 to +1.00 diopters. The central corneal thickness, thinnest point value and location, anterior and posterior surface curvatures, total corneal power, and corneal wavefront aberrations were measured for distance vision using the dual Scheimpflug-Placido system. Three consecutive measurements were taken in each eye.
Twenty-five eyes were evaluated. Repeated-measures analysis of variance showed the only statistically significant difference between the 3 repeated measures to be in trefoil aberration. Intraclass correlation coefficients (ICCs) were higher than 0.950 for all the parameters except the thinnest point chord distance to geometric corneal center (0.528) and chord angle (0.742), corneal astigmatism (0.811) and its vector components J0 (0.891) and J45 (0.724), and all wavefront aberrations.
The new dual Scheimpflug-Placido system had high intraobserver repeatability for corneal power and thickness and moderate repeatability for corneal astigmatism and corneal wavefront aberrations in healthy corneas with low astigmatism. This iteration of the device performed better in young healthy corneas than preceding versions.
No author has a financial or proprietary interest in any material or method mentioned.
确定一种最近推出的双摄像头旋转式Scheimpflug - Placido成像系统（Galilei G4）在测量年轻健康受试者角膜厚度、屈光力和波前像差方面的受试者内重复性。
西班牙巴伦西亚的巴伦西亚大学。
诊断技术的前瞻性评估。
该研究纳入了25名年龄在20至40岁之间、等效球镜度数在 -4.25至 +1.00屈光度之间的受试者的右眼。使用双Scheimpflug - Placido系统测量远视力时的中央角膜厚度、最薄点值及位置、前后表面曲率、总角膜屈光力和角膜波前像差。每只眼睛连续测量3次。
共评估了25只眼。重复测量方差分析显示，3次重复测量之间唯一具有统计学显著差异的是三叶草像差。除了到角膜几何中心的最薄点弦距（0.528）和弦角（0.742）、角膜散光（0.811）及其矢量分量J0（0.891）和J45（0.724）以及所有波前像差外，所有参数的组内相关系数（ICC）均高于0.950。
新型双Scheimpflug - Placido系统在低散光的健康角膜中，对于角膜屈光力和厚度具有较高的观察者内重复性，对于角膜散光和角膜波前像差具有中等重复性。该设备的这一版本在年轻健康角膜中的表现优于之前的版本。
没有作者对文中提及的任何材料或方法拥有财务或专利权益。
