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- Symptoms: decreased best-corrected vision.
- Signs: corneal epithelial cells invade and grow under the corneal flap.
- Possible causes: implantation of epithelial cells during surgery, poor-quality blade, improper repositioning of the flap or gap between stromal bed and flap.
- Complication: irregular astigmatism, flap melting.
- Treatment: re-elevating the flap and irrigation with scraping of the stromal bed as well as the flap undersurface.