VISX STAR S3准分子激光治疗散光的向量分析  

Vector analysis following astigmatic correction by VISX STAR S3 excimer laser

作　　者：周少博[1] 路晓明[1] 苏小波[1] 洪海峰[1] 麦庆怡[1] 黎健菁[1] 胡群英[1] 

机构地区：[1]广州医学院第一附属医院眼科,510120

出　　处：《眼科研究》2010年第6期555-558,共4页Chinese Ophthalmic Research

摘　　要：目的运用散光的向量分析法对VISXSTARS3准分子激光治疗中高度散光的疗效进行评价。方法采用回顾性方法研究接受VISXSTARS3准分子激光角膜原位磨镶术(LASIK)的散光患者25例36眼,术前散光度2.0～4.25D,术后随访6个月以上,根据手术前后主觉验光结果 ,运用Alpins散光向量分析法分析目标诱导散光向量(TIA)、手术诱导散光向量(SIA)、错位角(AE)、矫正指数、成功指数(IOS)、变平指数(FI)等向量参数改变。结果平均TIA为(2.68±0.73)D,平均SIA为(2.67±0.8)D;平均矫正指数为0.98±0.18,95%可信区间为(0.93～1.04),无显著性系统性欠矫或过矫;平均绝对AE为3.30°±3.8°;平均AE为-0.92°±4.98°,95%可信区间为(-2.55°～0.71°),无显著性系统性轴向错位;平均IOS为0.18±0.17,成功率(ROS)为0.80±0.17,平均FI为0.97±0.18。矫正指数与散光度及球镜度均无显著相关性(r=-0.16,r=0.23,P>0.05),成功指数与散光度及球镜度亦无显著相关性(P>0.05),TIA与SIA呈正相关(r=0.80,P<0.05)。结论 VISXSTARS3激光矫治中高度散光的准确性和成功率均较高,向量分析提供了必要的和易于理解的散光改变信息。BackgroundMost previous studies just analyzed the magnitude of the astigmatism.But seldom studies evaluate the direction of astigmatism.ObjectivePresent study was performed to evaluate the efficacy of VISX STAR S3 excimer laser for the correction of astigmatism by vectorial astigmatism outcome analysis.MethodsThis retrospective study was comprised in 36 eyes of 25 patients with astigmatism diopter from 2.0D to 4.25D following VISX STAR S3 excimer laser.The laser ablation was performed using VISX STAR S3 excimer laser system.Subjective refraction was performed before and after operation in all the patients.The follow-up duration was 6 months.Astigmatic parameters,including mean target induced astigmatism（TIA）,surgery-induced astigmatism vector（SIA）,angle of error（AE）,correction index,index of success（IOS）and flatten index（FI）,were calculated by Alpins vector analysis method.ResultsThe mean target induced astigmatism（TIA）magnitude was（2.68±0.73）D,mean SIA magnitude was（2.67±0.8）D,mean corrective index was 0.98±0.18 after VISX STAR S3 excimer laser,showing that no significant systematic undercorrection or overcorrection appeared with the confidence interval（0.93-1.04）.The mean absolute AE value was（3.30±3.8）° and mean AE value was（-0.92±4.98）° with the confidence interval was（-2.55-0.71）.The mean IOS was（0.18±0.17）,and the FI was（0.97±0.18）.No significant correlation was found between corrective index and astigmatism diopter（r=-0.16,P0.05）or spherical diopter（r=0.23,P0.05）.The same outcome was showed between IOS and astigmatism diopter（r=-0.17,P0.05）or spherical diopter（r=0.005,P0.05）.TIA was significantly correlated with SIA（r=0.80,P0.05）.ConclusionVISX STAR S3 excimer laser can accurately correct moderate and high astigmatism.Vector analysis offers some necessary information for astigmatic changes after excimer laser.

关 键 词：散光 角膜屈光手术 向量 准分子激光 

分 类 号：R779.63[医药卫生—眼科]