Although effective at correcting simple spherocylindrical refractive errors, conventional laser refractive surgery potentially can have the undesirable effects of inducing spherical aberrations and reducing vision quality. When performing conventional photorefractive keratectomy (PRK), the excimer laser pulses delivered to the periphery of the cornea have a decreased ablation effect because of their oblique angle of incidence on the corneal surface compared with centrally delivered pulses. This causes the cornea to be more oblate than prolate, thereby inducing more spherical aberration.1–5

中文翻译：

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近视眼的波前引导和波前优化的PRK的前瞻性，随机，眼对眼比较的一年结果

尽管有效地矫正了简单的球面屈光不正，常规的激光屈光手术仍可能具有引起球差和降低视力的不良影响。当执行常规的光折射角膜切除术（PRK）时，与中心传递的脉冲相比，传递到角膜外围的受激准分子激光脉冲的入射角减小，因为其在角膜表面的倾斜入射角。这导致角膜比扁圆形更扁，从而引起更多的球差。1-5