近视眼准分子激光原位角膜磨镶术后角膜非球面性的改变  

The changes of corneal asphericity after myopic laser in situ keratomileusis.

作　　者：王小娟 王勤美[2] 王丹梅 崔建萍 孟觉天 陶育华[2] 

机构地区：[1]徐州市眼病防治研究所,江苏徐州221000 [2]温州医学院眼视光医院,浙江温州325000

出　　处：《眼视光学杂志》2007年第4期242-244,共3页Chinese Journal of Optometry & Ophthalmology

基　　金：温医-科医人屈光手术和像差研究基金资助项目

摘　　要：目的研究近视眼准分子激光原位磨镶术(laser in situ keratomileusis,LASIK)后角膜非球面性的改变。方法对93例近视眼患者(148眼)LASIK术后进行回顾性分析,用Orb-scan-Ⅱ角膜地形图仪测量角膜在LASIK术前和术后非球面参数Q值、角膜曲率simk值(K)、切削的偏心值。分析Q值、角膜曲率改变(△K),△Q与预期矫正值(SE)、△K之间的相关性,以及术后Q值与偏心量之间的相关性。结果角膜形状从术前扁长型(Q<0)到术后为扁圆型(Q>0);角膜曲率变平;△Q与SE、△K之间存在相关性(分别为r=0.771,P<0.01和r=0.783,P<0.01),但术后Q值与偏心量之间无相关性(r=0.068,P>0.05)。结论近视患者LASIK术后角膜非球面参数Q明显增大,变化量与预期矫正值、曲率变化量相关。Objective To analyze the changes of corneal asphericity after myopic laser in situ keratomileusis （LASIK）. Methods In a retrospective case series, 93 patients （148 eyes） with myopia or myopic astigmatism who had LASIK were evaluated. Orbscan- Ⅱ was used to obtain corneal asphericity （Q） and simulated keratometer reading（K）, eccentric value（D） before and after LASIK. Corneal asphericity was evaluated to determine the association with attempted correction K and D. Results After myopic LASIK, all corneas exhibited increased positive central Q. The asphericity change （Delta Q）was highly correlated with the achieved correction （r = 0.771, P 〈0.01） and K change（Delta K） （r=0.783,P〈0.01）,but the postoperative Q value not with the eccentric value （r=0.068,P〉0.05）. Conclusion Asphericity may be a useful quantitative descriptor of the corneal optical contour after myopic LASIK. Positive central Q increased after byperopic LASIK, especially when greater degrees of refractive correction were attempted.

关 键 词：准分子激光原位磨镶术 角膜 非球面性 Q值 角膜曲率 

分 类 号：R779.63[医药卫生—眼科]