Corneal Deformation Measurement Using Scheimpflug Noncontact Tonometry
Corneal Deformation Measurement Using Scheimpflug Noncontact Tonometry
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DOI：
10.1097/opx.0b013e318279eb87
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发表时间：
2013-01-01
影响因子：
1.4
通讯作者：
Lam, Andrew K. C.
中科院分区：
文献类型：
--
作者：
Hon, Ying;Lam, Andrew K. C.
目的.目的：探讨Scheimpflug非接触式眼压计（Corvis ST）测量正常人角膜变形的检查者间和检查者间重复性。37名年龄在20 - 48岁的成年人被邀请分别使用Corvis ST和Pentacam进行角膜变形和曲率测量。在上午9：00至11：00之间对每台仪器进行三次连续测量，以进行检查者内重复性分析。受试者在同一天下午3：00至5：00之间返回进行会话间再现性分析。Corvis ST测量的最可重复的角膜参数是中央角膜厚度（[CCT] ICC，0.96;精度，10.85 μ m;重复性，15.34 μ m; CV，1.01%），然后是变形幅度（[DA] ICC，0.80;精度，0.08 mm;重复性，0.13 mm; CV，4.33%），第一次压平时间（[1st A-时间] ICC，0.77;精密度，0.22毫秒;重复性，0.31毫秒; CV，1.42），和眼内压（[IOP] ICC，0.75;精密度，1.39 mmHg;重复性，1.97 mmHg; CV，4.98）。其他参数重复性较差。DA和第一A时间显示出良好的会话间重现性。DA的95%一致性限值为+0.13至（-）0.13 mm，第1次A时间的95%一致性限值为+0.27至（-）0.33毫秒。DA与中央角膜厚度呈负相关（r = 0.53，p < 0.001），与角膜曲率无相关性（最平曲率r = 0.13，p = 0.46;最陡曲率r = 0.05，p = 0.75）。角膜变形参数DA和第一次A时间是可重复的和可再现的。较薄的角膜与较高的角膜变形相关。DA的测量用作角膜生物力学性质的指标。（Optom维斯科学2013;90：e1-e8）
Purpose. To determine the intraexaminer repeatability and intersession reproducibility of corneal deformation measurement using Scheimpflug noncontact tonometry (Corvis ST) on normal subjects.Methods. Thirty-seven adults aged 20 to 48 years were invited to have their corneal deformation and curvature measurements taken using Corvis ST and Pentacam, respectively. Three consecutive measurements were taken for each instrument between 9:00 and 11:00 AM for intraexaminer repeatability analysis. Participants returned between 3:00 and 5:00 PM the same day for intersession reproducibility analysis.Results. The most repeatable corneal parameter measured by Corvis ST was central corneal thickness ([CCT] ICC, 0.96; precision, 10.85 mu m; repeatability, 15.34 mu m; CV, 1.01%), followed by deformation amplitude ([DA] ICC, 0.80; precision, 0.08 mm; repeatability, 0.13 mm; CV, 4.33%), first applanation time ([1st A-time] ICC, 0.77; precision, 0.22 milliseconds; repeatability, 0.31 milliseconds; CV, 1.42), and intraocular pressure ([IOP] ICC, 0.75; precision, 1.39 mm Hg; repeatability, 1.97 mm Hg; CV, 4.98). Other parameters showed poor repeatability. The DA and 1st A-time showed good intersession reproducibility. The 95% limits of agreement were +0.13 to (-)0.13 mm for DA and +0.27 to (-)0.33 milliseconds for 1st A-time. The DA was negatively correlated with central corneal thickness (r = (-)0.53, p < 0.001) but not with corneal curvatures (flattest curvature, r = 0.13, p = 0.46; steepest curvature, r = 0.05, p = 0.75).Conclusions. Corneal deformation parameters DA and 1st A-time were repeatable and reproducible. A thinner cornea was associated with a higher corneal deformation. Measurement of DA serves as an indicator of corneal biomechanical properties. (Optom Vis Sci 2013;90:e1-e8)