LASIK手术治疗-2．0D以上散光的角膜地形图分析  

Assessment of the effects of LASIK on astigmatism of-2.0D or above by corneal topography

作　　者：周少博[1] 路晓明[1] 洪海峰[1] 苏小波[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,广州510120

出　　处：《中国实用眼科杂志》2010年第2期149-151,共3页Chinese Journal of Practical Ophthalmology

摘　　要：目的利用角膜地形图评价LASIK治疗-2．0D以上散光疗效的准确性。方法对25例（36只眼）散光度在-2．0D以上的近视散光患者于LASIK手术前后行角膜地形图和主觉验光检查，并将主觉验光测得的散光值换算成角膜平面的散光值，随访6月以上，比较手术前后角膜地形图测得的角膜散光的改变情况以及主觉验光所得的散光改变。结果手术前后平均角膜地形图散光大小分别为（-2．29±0．61）D和（一1．91±0．68）D，主觉验光手术前后平均角膜平面的散光大小分别为（-2．22±0．61）D和（-0．46±0．43）D，两者手术前后差异均有统计学意义（P〈0．05）；手术前后平均角膜地形图散光轴位改变（3．19±3．04）度，手术前后显性散光轴位改变（29．61±29．49）度；术前角膜地形图散光和术前显然验光角膜平面的散光大小差异无统计学意义（P〉0．05），散光轴位平均差异为（6．53±14．19）度，而术后角膜地形图散光和术后显然验光角膜平面的散光大小差异有统计学意义（P=0．00）。结论角膜地形图测量术前-2．0D以上散光与主觉验光结果基本一致，但LASIK术后，角膜地形图往往高估术后的散光值。Objective To investigate the accuracy of the effects of laser in situ keratomileusis （LASIK） on astigmatism of-2.0D or above assessed by corneal topography.Methods Thirty-six eyes of 25 patients with astigmatism of-2.0D or above who underwent LASIK were included in this retrospective study. Corneal topography and subjective refraction examination were performed before and at least 6 months after surgery.The astigmatism of subjective refraction was translated to cylinder diopter of corneal plane.Astigmatism measured with corneal topography and that of subjective refraction was compared before and after the surgery. Results The mean astigmatism measured by corneal topography was （-2.29± 0.61 ） D and （-1.91± 0.68） D pre- and postoperative respectively.The mean astigmatism in corneal plane measured by manifest refraction was （ -2.22± 0.61 ） D and （-0.46± 0.43） D pre- and postoperative respectively.The differences between pre- and post-operation were both statistically significant （P〈0.05）.The mean difference between pre- and post-operation in axis of astigmatism measured by corneal topography and manifest refraction was 3.19± 3.04 degree and 29.61± 29.49 degree, respectively.The mean difference in axis of astigmatism measured by corneal topography and manifest refraction was （6.53± 14.19） degree preoperatively.The difference in magnitude of refractive and corneal astigmatism was not statistically significant preoperatively （P =0.54）, but was significant postoperatively （P =0.00）.Conclusions Astigmatism of-2.0D or above measured by corneal topography has .agreement with that measured by subjective refraction pre-operatively, however, the astigmatism post-LASIK can always be overestimated by corneal topography.

关 键 词：散光 角膜地形图 激光角膜磨镶术 

分 类 号：R779.6[医药卫生—眼科]