矢量分析法评价眼内散光对飞秒激光LASIK治疗散光的影响

Applying vector analysis to evaluate influence of ocular residual astigmatism on astigmatism correction by FS-LASIK

目的应用矢量分析法评价眼内散光(ocular residual astigmatism,ORA)对飞秒激光LASIK治疗散光的影响。方法收集2016年1月至4月在我院行飞秒激光LASIK的患者182例。应用矢量分析法计算ORA,ORA大于等于散光的为高眼内散光组(high ocular residual astigmatism group,HORAG),反之则为低眼内散光组(low ocular residual astigmatism group,LORAG)。术后随访6个月,比较两组裸眼视力以及散光矫正率和误差率。结果术前所有患者ORA为(0.61±0.27)D,其中超过0.75D者58例(31.9%);HORAG患者的ORA大于LORAG患者,两组差异有统计学意义(P<0.05)。术后6个月HORAG患者裸眼视力为1.06±0.15,LORAG患者裸眼视力为1.08±0.15,两组差异无统计学意义(t=0.97、P=0.35);HORAG误差率(58.11±63.23)%大于LORAG(26.12±35.37)%,两组差异有统计学意义(t=3.43、P<0.05);HORAG矫正率(146.45±86.63)%较LORAG(122.56±36.31)%大,两组差异有统计学意义(t=2.81、P<0.05)。结论ORA较大时增加飞秒激光LASIK治疗散光的误差率,影响散光矫正率,进行屈光手术前应进行散光来源分析。

Objective To investigate the influence of ocular residual astigmatism（ORA）on the correction of astigmatism by FS-LASIK with vector analysis.Methods The records of 182 patients who had accept FS-LASIK between January,2016 and April,2016 were retrosepectively reviewed.The patients whose ORA≥refractive cylinder were assigned to high ocular residual astigmatism group （HORA group）,ORA〈refractive cylinder were assigned to low ocular residual astigmatism group （LORA group）.All of the patients were followed 6 months or more.The visual acuity,error ratio and correction ratio were compared between HORA group and LORA group.Results The preoperative ORA of all patients was（0.61±0.27）D,in which 〉0.75 D were 58 cases （31.9%）,and the HORA group was more than the LORA group （P〈0.05）.At postoperative 6 months,there was no statistically significant difference in vision acuity between the HORA group （1.06±0.15） and LORA group （1.08±0.15） （t=0.97,P=0.35）.There was statistically significant difference in the error ratio between the HORA group （58.11±63.23） % and LORA group （26.12±35.37） % （t=3.43,P〈0.05）.There was statistically significant difference in the correction ratio between the HORA group （146.45±86.63） % and LORA group （122.56±36.31） % （t=2.81,P〈0.05）.Conclusion The error ratio and correction ratio of astigmatic correction by FS-LASIK is significantly higher in eyes with high ORA than in eyes with low ORA.Vector analysis should been carried out before the FS-LASIK.