摘要
评价准分子激光角膜原位磨镶术 ( L aser in situ keratomileusis,LASIK)矫治近视眼术后切削中心的偏移对术后最佳矫正视力的影响。方法 :应用角膜地形图仪对 1 85例 ( 35 6眼 ) L ASIK术后随访 6个月以上的术前、术后角膜地形图进行观察分析 ,测量准分子激光切削中心相对于瞳孔中心的距离、方向 ,并用视功能进行比较。结果 :激光切削中心相对于瞳孔中心的距离平均偏心值为 0 .38± 0 .2 6 mm;其中偏离瞳孔中心 0 .5 mm以内为 2 6 3眼 ( 73.9% ) ,0 .5～ 1 .0 mm为 85眼 ( 2 3.9% ) ,1 .0～ 1 .2 mm者为 8眼 ( 2 .2 % ) ,切削中心位于鼻侧者为 32 0眼 ( 89.9% )。偏中心切削致术后最佳矫正视力下降 1～ 3行 :偏心量≤ 0 .5 mm中、小光区切削 9眼 ,偏心量 >0 .5 mm为 2 7眼。结论 :严重的偏中心切削将导致术后裸眼视力和最佳矫正视力下降 ,准确的切削中心定位和在条件允许情况下 ,适当扩大切削直径以及完整的角膜瓣对 L
To evaluate the effects of best corrected visual acuity postoperatively due to the decentered ablation on excimer laser in situ keratomileusis(LASIK)for treatment of myopia.Methods:The Corneal Analysis System was used for the analysis of corneal differential topographical maps gained preoperatively and postoperatively in 356 eyes of 185 patients with at least six months of follow up after LASIK to measure the direction and the distance of the center of ablation zone relative to the center of the pupil,and the visual acuity was compared.Results:The mean decentration from ablated center relative to the pupillary center was 0 38±0 26mm,263 eyes(73 9%)were centered within 0 5mm,85 eyes(23 9%)were decentered more than 0 5mm and 1 0～1 2mm in 8 eyes(2 2%).The ablated center of 320 eyes(89 9%)was located nasally.9 eyes with decetration of 0 5mm or lower used smallzone ablation and 27 eyes with decetration more than 0 5mm lost one to three lines of the best corrected visual acuity due to decentered ablation.Conclusion:The greatest decentered ablation will affect the recovery of the postoperative the uncorrected and the corrected visual acuity.The lager zone ablation and a complete flat corneal cap are significant in LASIK.
出处
《中国实用眼科杂志》
CSCD
2000年第9期565-567,共3页
Chinese Journal of Practical Ophthalmology
