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These are refractive procedures performed with an excimer laser. The excimer generates ultraviolet light of a specific wavelength (193 nanometers) by sending high-voltage electrical energy through a cavity containing Argon Fluoride gas. The beam that is emitted has enough energy to break the bonds between the molecules that make up the tissue on your eye's surface (the cornea). Because it is a photochemical and not a heating process, it allows the surgeon to sculpt very precise amounts of corneal tissue from above without any damaging to neighboring/adjacent tissue.
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