准分子激光治疗近视散光以其安全性和有效性,已成为当今屈光手术的首选术式。然而术后仍有一部分患者出现视觉质量下降,如眩光、光晕、对比敏感度下降以及夜间视力障碍等。随着角膜非球面性(cornealasphericity)概念的引入,临床医生逐渐认识到这些问题与眼角膜的非球面性改变存 Excimer laser treatment of myopic astigmatism with its safety and effectiveness, has become the preferred surgical operation of refractive surgery. However, after surgery there are still some patients with visual quality decline, such as glare, halo, decreased contrast sensitivity and night vision disorders. With the introduction of the concept of corneal sphericity, clinicians are increasingly aware of these problems with the preservation of the corneal asphericity