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The epithelial ingrowth under corneal flap is one of the complications after keratorefractive surgery, of which the incidence has declined dramatically with the improvement of relevant facilities and surgical techniques. However, epithelial ingrowth results from traumatic flap displacement has been describing in the literatures from time to time. If the prompt and efficient treatment cannot be taken, the severe complications of epithelial ingrowth will occur such as the alternation of refraction and cornea keratolysis. In this article, we reviewed the research progress of epithelial ingrowth after keratorefractive surgery.