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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 ASIK术后的效果应是十分重要的
To evaluate the effect of LASIK on the best corrected visual acuity after myopia correction of myopia surgery. Methods: The preoperative and postoperative corneal topography of 1 85 cases (35 6 eyes) LASIK followed up for more than 6 months were observed and analyzed by corneal topography. The distance from the excimer laser cutting center to the pupil center was measured , Direction, and use visual function to compare. Results: The average eccentricity of the laser cutting center relative to the center of the pupil was 0.38 ± 0.226 mm, with 26.3 eyes (73.9%) deviated from the center of the pupil within 0.5 mm, and 0.5 to 1. There were 85 eyes (23.9%) at 0 mm, 8 eyes (2.2%) at 1.0 to 1.2 mm and 320 eyes (89.9%) at the center of the nose. Partial centering of the best corrected visual acuity decreased 1 to 3 lines: the eccentricity ≤ 0 .5 mm, 9 cases of small light cutting, eccentricity> 0 .5 mm to 27 eyes. CONCLUSIONS: Severe eccentric centering leads to decreased visual acuity and optimal corrected visual acuity after surgery. Accurate centering of the cutting center and, if possible, appropriate enlargement of the cutting diameter and complete corneal flap effects after LASIK surgery should be Very important