Objective To evaluate the results of central corneal thickness( CCT ) measured by Orbscan topography system and ultrasonic pachymeter in myopia patients. Methods The central corneal thickness were measured with Orbscan topography system and ultrasonic pachymeter respectively in 68( 135 eyes ) subjects aged 18 ~41 years old. There were 46 male( 91 eyes )subjects and 22 female( 44 eyes )subjects. All subjects were divided into four groups according to their ultrasound pachymetry measurement and the equivalent myopia degree respectively, The results were compared. Results The average CCT measured by Orbscan topography system and ultrasonic pachymeter were ( 518.22 ± 31.80 )μm and ( 538.16 ± 29.30 ) μm. The measurement obtained from Orbscan topography system was lower than that from ultrasonic pachymeter and the difference is significant( P ＜ 0.01 ). but there was no difference among different myopia groups. Conclusion The CCT measurement from the devices differ and cannot be directly substituted for each other. Myopia degree has no correlation with CCT.%目的 比较Orbscan眼前节分析系统与超声测量角膜厚度的差异.方法 对我院屈光手术中心术前近视患者68例(135只眼),男46例(91只眼),女22例(44只眼),同时用两种方法测量角膜中央厚度,进行临床比较分析.结果 Orbscan眼前节分析系统、超声测量角膜中央平均厚度结果分别为(518.22±31.80)μm和(538.16±29.30)μm.超声测厚比Orbscan测量结果大19.94 μm,差异有显著统计学意义(P<0.01).根据超声角膜厚度测量结果及等效球镜度分别分组分析,任一组两种方法测量结果差异均有显著统计学意义(P<0.05).不同屈光度数组间角膜厚度差异无统计学意义(P>0.05).结论 采用系统默认校正系数,Orbscan眼前节分析系统与超声对近视患者角膜中央厚度检查结果存在一定差异,在屈光手术术前角膜厚度检查评估时应注意仪器间的差异.近视度数与角膜中央厚度无关.
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