ORBSCAN-Ⅱ角膜地形图仪与A超角膜测厚仪测量结果的对比观察

Corneal pachymetry measurement with ORBSCAN-Ⅱ Topography System vs ultrasonic pachymetry

目的 :将ORBSCAN Ⅱ角膜地形图仪与A超角膜测厚仪对角膜中央厚度的测量结果进行对比分析 ,寻找二者之间差异的规律性。方法 :随机选取 2 2 2例 ( 4 2 3只眼 )单纯屈光不正患者 ,对其角膜中央厚度分别行ORBSCAN Ⅱ和A超测量 ,将结果行统计学处理 ,并分析二者差值之间的分布情况。结果 :在对该 4 2 3只眼角膜中央厚度的测量中 ,A超测厚的结果为( 5 4 4 5 2± 3 2 4 3 ) μm ,ORBSCAN Ⅱ的测厚结果为 ( 5 15 3 9± 3 5 77) μm ,二者之间差异有显著性 (P <0 0 5 )。二者之间的差值的平均值为 ( 2 9 15± 13 61) μm。两种测厚方法的结果差值在 - 18～ 64μm之间 ,其中有 5 4 3 8%在 2 0～ 4 0 μm之间。具体分布及所占比例为 :差值≥ 60 μm的 2只眼 ,占 0 4 7% ;差值在 5 0～ 5 9μm的 2 6只眼 ,占 6 15 % ;差值在 4 0～ 4 9μm的 65只眼 ,占15 3 7% ;差值在 3 0～ 3 9μm的 12 6只眼 ,占 2 9 79% ;差值在 2 0～ 2 9μm的 10 4只眼 ,占 2 4 5 9% ;差值在 10～ 19μm的 67只眼 ,占 15 84 % ;差值在 0～ 9μm的 2 4只眼 ,占 5 67% ;差值在 0 μm以下的 9只眼 ,占 2 13 %。结论 :在中央角膜测厚方面 ,ORBSCAN Ⅱ测量值较A超测量值为小 ,二者之间的差值大多在 2 0～ 4 0 μm之间。A超测厚仍是目?

Objective:To evaluate corneal thickness measurement with Orbscan Ⅱ topography System vs ultrasonic pachmetry,try to find out the regularity of the difference between them.Method:The central corneal thickness of 222 patients (423 eyes) with simple refractive errors were measured with Orbscan Ⅱ topography system and ultrasonic pachymetry.The results were treated statistically and the differences were analysed.Results:Of the 423 eyes,the central corneal thickness measured with A scan was (544 52±32 43) μm,and that with Orbscan Ⅱ,(515 39±35 77)μm.The difference between them was significant (P<0 05).The difference of the results between these two methods was -18～64μm,with a mean value (29 15±13 61) μm,and 54 38% was between 20～40μm.The difference in 2 eyes (0 47%) was ≥60μm;in 26 eyes (6 15%) 50～59 μm,in 65 eyes (15 37%) 40～49 μm,in 126 eyes (29 79%) 30～39 μm,in 104 eyes (24 59%) 20～29 μm,in 67 eyes (15 84%) 10～19 μm,in 24 eyes (5 67%) 0～9 μm,and 9 eyes (2 13%) less than 0 μm.Conclusion:When to measure the central corneal thickness,the value obtained with Orbscan Ⅱ topography was lower than that with ultrasonic pachymetry about 20～40 μm.Ultrasonic pachymetry is still the most accurate method in corneal pachymetry.