角膜缘上皮基底层存在一种低分化并能被创伤激发而发生增殖的干细胞,角膜上皮就是由其增殖分化而来。当某些因素引起角膜缘组织破坏,致使角膜缘上皮内干细胞缺失时,就会影响角膜上皮的生长,从而引起新生血管及异常结膜上皮入侵,导致角膜损害。因此,角膜缘上皮移植是治疗角膜缘 The limbal epithelial basal layer there is a poorly differentiated and can be stimulated by trauma and proliferation of stem cells, corneal epithelium is derived from its proliferation and differentiation. When some factors cause the destruction of the corneal limbal tissue, leading to loss of limbal epithelial stem cells, it will affect the corneal epithelial growth, causing neovascularization and abnormal conjunctival epithelial invasion, leading to corneal damage. Therefore, limbal epithelial transplantation is the treatment of limbal limbus