LASIK术后非接触性眼压测定值的改变

目的:研究准分子激光原位角膜磨削术(laser·in situ keratomileusis,LASIK)术后非接触性眼压计(noncontact tonometer,NCT)测量值的准确性。方法:对180例(256只眼)近视患者行IASIK手术,手术前、后采用NCT测量患者的眼压,并测量角膜厚度和角膜曲率,进行统计学分析。结果:LASIK术后NCT测量值明显低于术前,差异有显著性(P<0.001),术后一年眼压下降(6.54±2.1)mmHg(1 mmHg=0.133 kPa)。术后一年眼压下降值与角膜厚度减少及角膜前表面曲率的降低有关(P<0.01),建立二元回归方程如下:Y=0.355+0.0342X1+0.365X2。Y:术前术后眼压差(mmHg),x1:术前术后角膜曲率差(D),x2:角膜切削厚度(μm)结论:LASIK术后NCT眼压测量值明显低于术前,术后所测量眼压与角膜切削厚度、角膜曲率有关。

Accuracy of Intraocular Pressure Measurement Using NCT after LASIK

PURPOSE: To study the accuracy of the intraocular pressure (IOP) after laser in situ keratomileusis (LASIK) with noncontact tonometer (NCT). METHODS: One hundred and eighty cases (256 eyes) myopias that had undergone LASIK were studied. IOP, corneal thickness and corneal curvature were measured before and after LASIK. The correlations were analyzed. RESULTS: The decrease of Iop using NCT was significantly obvious after LASIK (P < 0.001). One year after LASIK mean IOP drop was 6.54 +/- 2.1 mmHg. The reduction of IOP may be related to the decrease in corneal thickness and corneal curvature (P < 0.01). Regression equation for IOP drop (mmHg) = 0.355 + 0.0342X1 + 0.365X2 [X1 = decrease in corneal curvature (D), X2 = ablation depth (microm)] CONCLUSIONS: The IOP readings after LASIK were lower than the real IOP values. IOP readings after LASIK were influenced by corneal thickness and refraction degree.