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  • LASIK, The Flap Never Heals This results in a weak, central and paracentral hypocellular primitive stromal scar that averages 2.4% as strong as normal comeal stroma. In contrast, the more superficial, flap margin stromal LASIK wound, which is adjacent to the surface epithelium, was found to heal by producing a 10-fold stronger, hypercellular fibrotic stromal scar that reaches maximum tensile strength by approximately 3.5 years after surgery, averaging 28.1% of normal.