Two. A vacuum ring is placed throughout the cornea, which serves to stabilize the eyeball in addition to functions as a platform for the microkeratome. When vacuum is activated, the eyesight results in being hazy and pressure on the attention is felt. LASIK just isn't encouraged for sufferers with keratoconus, https://linkdirectory724.com/listings13487977/lasik-eye-surgery-things-to-know-before-you-buy