斑点状角膜营养不良病变仅累及基质层，而角膜上皮层及内皮层正常；
In fleck corneal dystrophy, the lesion only involved stroma, epithelium and endothelium levels were normal.
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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