This procedure is very similar to PRK, except the top layer of the cornea is modified with a microkeratome, a highly sophisticated motorized device, which is applied to the cornea with suction under pressure. A very accurate thin flap is created and flipped to the side. The flap is then put back in place and irrigated to remove debris from the interface. Antibiotics and anti-inflammatories are also given to the patient. No bandage contact lens is placed to the patient is seen the next day.
Vision typically stabilizes after two months.
The second eye is also treated as soon as the patient is happy with the first eye. The advantages over PRK are that vision returns quicker, there is less discomfort, it can correct higher degrees of nearsightedness and there is less chance of scarring. The disadvantages is that because a flap is created, there is a slightly greater risk of complications such as decreased best corrected vision, interface problems and flap problems causing astigmatism. This procedure is thus dependent on surgeon experience. This procedure is also typically more expensive than PRK because additional equipment and blades have to be used.