Iris is the colored ring of tissue suspended behind the cornea and immediately in front of the lens. Keratectomy is the surgical removal of corneal tissue. Keratitis is the inflammation of the cornea. Kerato is the prefix indicating relationship to the cornea. Keratomileusis is the carving of the cornea formerly done with a lathe and blade and now done with an excimer laser.
Laser is an acronym for light amplification by stimulated emission of radiation.
A laser is an instrument that produces a powerful beam of light and can vaporize tissue. Lens is a part of the eye that provides some focusing power. The lens is able to change shape allowing the eye to focus at different distances. Microkeratome is a surgical device that is affixed to the eye by use of a vacuum ring. When secured, a very sharp blade shaves a small amount of the cornea at a predetermined depth.