2. A Vacuum ring is put across the cornea, which serves to stabilize the eyeball and also acts like a platform with the microkeratome. When vacuum is activated, the vision gets hazy and stress on the eye is felt. LASIK isn't recommended for people with keratoconus, as being the cornea https://moodjhomedia.com/story3402491/not-known-details-about-lasik-eye-surgery