(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
The surgeon then folds back the hinged flap to access the underlying 
cornea (called the stroma) and removes some corneal tissue using an excimer 
laser.