目的 :探讨 L ASIK手术治疗屈光不正术前患者的 ORBSCAN( ORB)与超声角膜测厚仪 ( A超 )测量值的相关性 ,并给出术前 A超预测值的回归公式。方法 :分别应用 ORB与 A超测量 74眼 L ASIK术前患者的中央角膜厚度 ,对两组测量值进行配对 t检验、直线相关及回归分析 ,并利用回归方程对 L ASIK术前 A超测量值进行预测。结果 :两组测量值之间有非常显著差异 ( P<0 .0 0 1) ,两者呈密切线性正相关 (相关系数 r=0 .918,T=19.6,P<0 .0 0 1) ,本组资料呈正态分布。结论 :L ASIK术前患者 ORB与超声角膜测厚仪测量值呈线性相关 ,A超预计值 ( μm) =16.5 + 0 .93 *ORB测量值 ( μm) ,ORB预计值 ( μm) =75 .3 4 + 0 .90 8*A超测量值 ( μm) Objective: To investigate the correlation between ORASCAN (ORB) and echocardiography (A-ultrasonography) before LASIK surgery in patients with refractive ametropia and to give the regression formula of preoperative A-predictive value. Methods: The central corneal thickness of 74 patients with L ASIK before surgery were measured by ORB and A-ultrasound. Paired t-test, linear correlation and regression analysis were performed on the two groups of measured values. Make a prediction Results: There was a significant difference between the two groups of measurements (P <0.001), with a close linear correlation (r = 0.918, T = 19.6, P <0.01) This group of data was normal distribution. CONCLUSIONS: There was a linear correlation between ORB and echocardiographic measurements before LASIK. A predicted value (μm) = 16.5 +0.93 * ORB measured value (μm), ORB predicted value (μm) = 75. 3 4 +0 .90 8 * A Ultra measured value (μm)