标准矢量分析法评价Epi—LASIK术对散光矫正效果  

Standardized vector analysis of correction of astigmatism after Epi-LASIK

作　　者：王树林[1] 刘平[1] 王新[1] 马蕊[1] 

机构地区：[1]郑州人民医院眼科,河南省郑州市450003

出　　处：《中国实用眼科杂志》2013年第5期523-526,共4页Chinese Journal of Practical Ophthalmology

基　　金：国家自然科学基金项目（11204277）

摘　　要：目的采用标准矢量分析法评价准分子激光角膜上皮瓣下磨镶术（Epi—LASIK）对散光的矫正效果，并对影响散光矫正效果的因素进行探讨。方法临床病例对照研究。对2009年6月至2011年6月在郑州人民医院眼科选取行Epi—LASIK术矫正近视散光的68只眼，分为中低度散光组（0．00～2．00D）和高度散光组（-2．25—4．00D），术后随访6个月。采用美国国家标准委员会推荐使用的标准矢量分析法对手术前后散光的相关指标进行运算和评估。结果矫正率（CR）与预期屈光矫正量的绝对值（｜IRC｜）呈正相关（r=0．82，P〈0．05），误差率（ER）与IIRCI呈负相关（r=-0．61，P〈0．05），角度误差的绝对值（｜EA｜）与｜IRC｜呈负相关（r=-0．74，P〈0．05），中低度散光的矢量误差的绝对值（1Evj）小于高度散光组，差异有统计学意义（P〈0．05）。中低度散光的大小误差（EM）为-0．12±0．15，高度散光组EM为-0．14±0．42。结论Epi—LASIK术对散光的矫正效果与散光轴向矫正的准确性关系密切，且应选择根据主觉验光时实际的顶点距换算出的角膜平面的散光度值作为手术矫正散光的参数。Objective To evaluate the correction of astigmatism after Epi-LASIK （epipolis laser in situ keratomileusis） by standardized vector analysis, and to investigate the factors that affect the outcome of correction. Methods Sixty-eight myopic astigmatism eyes treated with Epi-LASIK were divided into two groups, low-midrange astigmatism （0.00D --2.00D） group and high astigmatism （-2.25D --4.00D） group. The following-up period was for 6 months. The astigmatism status was evaluated based on the standardized vector analysis which was recommended by the American National Standards Institute. Results The CR （correction ratio） was positively correlated with IRC （absolute intended refractive correction） （r =0.82, P 〈0.05）. The ER （error ratio） was negatively correlated with IRC （r =-0.61, P 〈0.05）. The EA （absolute error of angle） was negatively correlated with IRC （r =-0.74, P 〈0.05）. The EV （absolute error vector） of low-midrange astigmatism group was significant lower than that of high astigmatism group （P 〈0.05）. The EM （error of magnitude） of low-midrange astigmatism group was -0.12±0.15 and EM of high astigmatism group was -0.14±0.42. Conclusions The effectiveness of the correction of astigmatism after Epi-LASIK is closely correlated with that of axis alignment of astigmatism, and the diopter of astigmatism which is set as surgery parameter shall be transferred from spectacle to corneal plane according to the vertex distance of manifest refraction.

关 键 词：矢量分析 散光 准分子激光角膜上皮瓣下磨镶术 

分 类 号：R779.63[医药卫生—眼科]