影响LASIK术后角膜后表面稳定性的相关因素

摘要：目的：探讨影响准分子激光原位角膜磨镶术( laser in situ keratomileusis,LASIK )术后角膜后表面稳定性的相关因素。方法：对来我院行LASIK手术的患者64例64眼分析术后6mo后表面变化与制瓣方式、角膜瓣厚度( flap thickness, FT)、切削厚度( ablation thickness,AT)、术后剩余基质厚度( postoperative residual corneal stroma thickness, RCST )、术前角膜薄点厚度( preoperative thinnest corneal thickness,CT)、角膜瓣厚度/术前角膜薄点厚度( flap thickness/ preoperative thinnest corneal thickness, FT/CT )、切削厚度/术前角膜薄点厚度( ablation thickness/preoperative thinnest corneal thickness, AT/CT )、剩余基质厚度/术前角膜薄点厚度( postoperative residual corneal stroma thickness /preoperative thinnest corneal thickness, RCST/CT)、术前角膜地形图(前表面高度、后表面高度、后表面diff值)和术前眼压的相关性。结果：本研究表明手术前后角膜后表面diff差值与屈光度(r=0.419,P=0.014),AT(r=0.394,P=0.023),AT/CT(r=0.501,P=0.004),术前角膜后表面diff值(r=0.501,P=0.004),RCST(r=-0.385,P=0.033)和RCST/CT(r=-0.401, P=0.025)相关。手术前后角膜后表面高度差值与屈光度(r=0.520,P=0.002),AT(r=0.504,P=0.003),AT/CT(r=0.442,P=0.013),角膜后表面diff值(r=0.624,P=0.000)和RCST/CT(r=-0.394,P=0.028)相关。结论：AT,RCST,AT/CT,RCST/CT和术前角膜地形图后表面diff值应作为预测术后角膜后表面稳定性的关键性指标,但具体安全限度值有待进一步研究。