In Femtorefractive LASIK (ReLEXT""), the surgeon uses a specialised femtosecond laser to create a pocket of tissue within the cornea and delineate a lens of corneal tissue, which is then removed either through a tunnel or by lifting a flap of overlying corneal tissue. The tissue removed creates a shape change within the cornea and this leads to focusing of the vision. Within a few hours, the surface layer (epithelium) begins to grow over the edge to seal the tunnel or flap edge.
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