下睑缘。从内侧到外侧下睑缘轻微弯曲，在瞳孔和外侧异色边缘之间最低。
Lower lid margin. It should bow gently from medially to laterally, with the lowest point between the pupil and the lateral limbus.
正常眼睛中的异色边缘中的干细胞就象工厂，能够生产出新的细胞来替代死亡的角膜细胞。
In a normal eye, stem cells in the limbus are like factories, churning out new cells to replace dead corneal cells.
正常眼睛中的异色边缘中的干细胞就象工厂，能够生产出新的细胞来替代死亡的角膜细胞。
In a normal eye, stem cells in the limbus are like factories, churning out new cells to replace dead corneal cells.
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