How does the flap stay in place in LASIK?

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Initially, the flap is kept in position by a vacuum effect. The cells lining the inner surface of your cornea, known as endothelial cells, pump water out to the inner part of the eye. This suction holds the flap in place. During the first few hours after surgery the outer surface of the cornea, known as the epithelium, seals the edges of the flap. Over the ensuing weeks, natural substances inside your cornea bond the flap to the underlying tissue.