Two. A vacuum ring is put throughout the cornea, which serves to stabilize the eyeball and also functions to be a platform for the microkeratome. When vacuum is activated, the vision will become hazy and force on the eye is felt. LASIK isn't well suited for correcting eyesight troubles because https://wekurehealth.com/blog/regarded-as-frontline-in-lasik-eye-surgery-in-delhi-gurgaon-noida/