Under normal conditions,limbal stem cells have protective screen function for cornea,and they can prevent conjunctival epithelium and new blood vessel from growing to cornea.

• 正常情况下角膜缘干细胞具有上皮屏障的作用,能阻止结膜上皮及血管向角膜内生长。角膜缘干细胞缺乏将导致各种眼表功能异常。