目的：观察准分子激光治疗性角膜切削术(PTK)对角膜浅层病变的疗效。
Objective: to investigate the treatment of corneal superficial diseases with photo therapeutic keratectomy (PTK).
目的探讨准分子激光屈光性角膜切削术（PRK）后角膜表面形态和屈光力变化。
ObjectiveTo investigate the change in corneal surface shapes and refractive powers after photorefractive keratectomy(PRK).
光性折射角膜切削术使用的方法是削去角膜的顶层，又称上皮层，来显露下面的基质层。
In PRK, the top layer of the cornea, called the epithelium, is scraped away to expose the stromal layer underneat.
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