Effect of expanding the treatment zone of the Nidek EC‐5000 laser on laser in situ keratomileusis outcomes
Effect of expanding the treatment zone of the Nidek EC‐5000 laser on laser in situ keratomileusis outcomes
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DOI：
10.1016/j.jcrs.2004.05.015
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发表时间：
2004-11
影响因子：
2.8
通讯作者：
M. Macsai;Karen Stubbe;A. Beck;Z. B. Ravage
中科院分区：
文献类型：
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作者：
M. Macsai;Karen Stubbe;A. Beck;Z. B. Ravage
目的评价扩大Nidek EC-5000激光治疗区对激光原位角膜磨镶术（LASIK）术后视力以及夜间眩光和光晕的影响。美国。方法本前瞻性研究包括154例连续患者的301只眼，由1名具有角膜磨镶术和准分子激光屈光手术经验的外科医生使用Nidek EC-5000激光器对单眼或双眼进行LASIK。使用6.5 mm光学区，过渡区比暗视条件下的瞳孔大1.0 mm（7.5、8.0、8.5或9.0 mm）。根据定制的临床列线图计算目标矫正。所有患者术前和术后3个月使用问卷调查眩光和光晕分配数值的程度感知的视觉障碍（0 =无眩光或光晕，1 =最小，2 =中度，3 =严重）。基线最佳视力矫正视力为20/20或更好。平均术前屈光球镜为−6.33屈光度（D）± 2.80（SD）（范围为−1.00至−16.25 D），平均术前屈光柱镜为0.86 ± 0.83 D（范围为0至+3.25 D）。术后3个月，78%的患眼的UCVA为20/20，99%的患眼的UCVA为20/40或更好。术前94眼（31%）有眩光和光晕。3个月时，11例患者的19只眼出现眩光、光晕或两者兼有（百分之六点三）（P<.0001）; 14只眼，结论在暗视条件下，使用比瞳孔大1.0 mm的周边过渡区，术后眩光和光晕的发生率较低，并且不会对视力产生不良影响敏锐度术后并发症包括角膜扩张没有增加。
PurposeTo evaluate the effect of expanding the treatment zone of the Nidek EC-5000 laser on postoperative visual acuity as well as night glare and halos after laser in situ keratomileusis (LASIK) using 4 ablation zone diameters.SettingDivision of Ophthalmology, Evanston Northwestern Healthcare and Northwestern University Medical School, Glenview, Illinois, USA.MethodsThis prospective study comprised 301 eyes of 154 consecutive patients who had LASIK in 1 or both eyes using the Nidek EC-5000 laser by 1 surgeon with experience in keratomileusis and excimer laser refractive surgery. A 6.5 mm optical zone was used with a transition zone 1.0 mm larger than the pupil under scotopic conditions (7.5, 8.0, 8.5, or 9.0 mm). Targeted correction was calculated according to a customized clinical nomogram. All patients were queried about glare and halos preoperatively and 3 months postoperatively using a questionnaire assigning numeric values to the degree of perceived visual disturbance (0 = no glare or halos, 1 = minimal, 2 = moderate, 3 = severe).ResultsThe baseline uncorrected visual acuity (UCVA) was 20/200 or worse in 293 eyes. The baseline best spectacle-corrected visual acuity was 20/20 or better. The mean preoperative refractive sphere was −6.33 diopters (D) ± 2.80 (SD) (range −1.00 to −16.25 D) and the mean preoperative refractive cylinder, 0.86 ± 0.83 D (range 0 to +3.25 D). Three months postoperatively, 78% of eyes had a UCVA of 20/20 and 99%, of 20/40 or better. Preoperatively, 94 eyes (31%) had glare and halos. At 3 months, glare, halos, or both were present in 19 eyes of 11 patients (6.3%) (P<.0001); in 14 eyes, patients reported less severe glare and halos postoperatively than preoperatively.ConclusionsThe use of a peripheral transition zone 1.0 mm larger than the pupil under scotopic conditions resulted in a low incidence of glare and halos postoperatively and did not adversely affect visual acuity. There was no increase in postoperative complications including corneal ectasia.