Pentacam测量近视眼角膜厚度和前房深度

Measuring central corneal thickness and anterior chamber depth in myopia with Pentacam Scheimpflug imaging system

目的:比较Pentacam三维眼前节分析仪测量中央角膜厚度、前房深度与A型超声测量的差异,以评价Pentacam在眼前节参数测量中的准确性。方法:分别使用Pentacam眼前节分析仪和A型超声角膜测厚仪测量82例164眼近视患者的中央角膜厚度和前房深度,对两种方法的测量结果进行比较,并与眼压及眼轴长度进行了相关分析。结果:Pentacam眼前节分析仪测得中央角膜厚度和前房深度分别为524±0.037μm,3.26±0.25mm。A型超声角膜测厚仪测得值分别为521±0.036μm,3.36±0.53mm。两种测量结果比较中央角膜厚度和前房深度差异均有统计学意义(P<0.01,P<0.05)。光学法测量的中央角膜厚度值较超声法平均大3μm。超声法所测前房深度值较光学法平均大0.1mm。两种方法测量的角膜厚度与眼压及前房深度与眼轴长度均呈正相关(P<0.01)。结论:Pentacam三维眼前节分析仪测量屈光不正患者的中央角膜厚度和前房深度与A型超声测量结果存在一定差异。

AIM： To assess the accuracy of Pentacam Scheimpflug imaging system in the measurement of central corneal thickness and anterior chamber depth in myopia. METHODS： Pentacam Scheimpflug imaging system and A-scan ultrasonic pachymetry were used to measure the central corneal thickness and anterior chamber depth in 82 patients 164 eyes with myopia. The results of two methods were compared. The results were analyzed with SPSS 16.0. Correlation analysis was performed in intraocular pressure and axial length. RESULTS： The value of central corneal thickness measured by the Pentacam Scheimpflug imaging system was 524±0.037μm, and by A-scan ultrasonic pachymetry was 521±0.036μm. There was significant difference between the results of these two methods（P〈0.01）. The value of anterior chamber depth measured by the Pentacam Scheimpflug imaging system was 3.26±025mm, and by A-scan ultrasonic pachymetry was 336±0.53mm. There was significant difference （P〈005）, and significant linear correlation between the two methods（P〈001）. The average central corneal thickness was 3μm by optics; average anterior chamber depth was 0.1mm by ultrasound. The two methods for measuring the central corneal thickness and intraocular pressure and the anterior chamber depth and axial length were positively related （P〈0.01）. CONCLUSION： There exists certain difference in the central corneal thickness and the anterior chamber depth for ametropia measured by Pentacam, a three-dimensional anterior segment analyzer and A-scan ultrasonic pachymetry.