(Jon of the Clue Crew shows an anatomical diagram on the monitor.)  When Lasik eye surgery is performed, a flap is made in the eye, folded back, & then the stroma, or middle section, of this eye part is reshaped using lasers
Massachusetts Eye and Ear Infirmary, Boston, .... 
tissue can be ablated directly and reshaped with an excimer laser beam (1,2).