s a more complex 3 - step procedure 1) A flap is created and peeled to the side (like an orange peel) 2) The laser removes tissue from the exposed area 3) The flap is rolled back into position
benefits: fast, virtually painless recovery. less chance os either scarring or corneal erosion(surface break down) compared to prk.,things to consider:potential for flap complcations. tissue is removed at a deeper level of the cornea, and there is a potentially greater risk to structurally weaken the eye comoard ti prk. 
may be inappropriate to have permanent flap with certain jobs or hobboes : construction, milltary, martial arts.
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