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目的 :定量分析LASIK术后角膜不规则散光改变与激光切除量的关系。方法 :对近视眼行LASIK手术 ,术前和术后一个月测量角膜地形图 ,计算角膜不规则散光 ,采用傅立叶函数分析方法对数据进行分析。结果 :LASIK术后 ,角膜不规则散光的程度明显增高 (P <0 .0 0 0 1) ,不规则散光程度与切削的深度显著相关 (r =0 .44 0 ,P <0 .0 0 0 1)。结论 :LASIK手术明显增高角膜的不规则散光 ,其不规则散光的程度与激光切削量密切相关。
Objective: To quantitatively analyze the relationship between the changes of corneal irregular astigmatism and laser ablation after LASIK. Methods: The myopia was operated under LASIK. The corneal topography was measured one month before and after surgery. Irregular astigmatism was calculated. The data were analyzed by Fourier function analysis. Results: The degree of corneal irregular astigmatism was significantly increased after LASIK (P <0.01 0). The degree of irregular astigmatism was significantly correlated with the depth of cutting (r = 0.44 0, P <0 0 0 0 1). Conclusion: LASIK significantly increases the irregular astigmatism of the cornea. The degree of irregular astigmatism is closely related to the amount of laser ablation.