当然，在极少数情况下，角膜会逐渐地变地很薄，形成圆锥形角膜。
There is also a relatively rare condition called keratoconus where the cornea becomes progressively thinner and cone shaped.
圆锥角膜是一种角膜的结构退化，病发时患者角膜由正常情况下的圆形逐渐鼓胀成圆锥形。
Keratoconus is a deterioration of the structure of the cornea with gradual bulging from the normal shape to a cone shape.
圆锥角膜是一种角膜的结构退化，病发时患者角膜由正常情况下的圆形逐渐鼓胀成圆锥形。
Keratoconus is a deterioration of the structure of the cornea with gradual bulging from the normal shape to a cone shape.
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