Upper lid entropion involves the eyelashes rubbing on the eye, but the lower lid usually has no eyelashes, so hair rubs on the eye.

 
  • 上眼瞼內翻導致睫毛摩擦眼球,而下眼瞼通常沒(méi)有睫毛,因此下眼瞼內翻引起毛發(fā)摩擦眼球。
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