Two. A vacuum ring is put throughout the cornea, which serves to stabilize the eyeball and likewise acts being a System for that microkeratome. When vacuum is activated, the vision turns into hazy and strain on the eye is felt. LASIK can most likely increase eyesight challenges due to refractive https://gettydirectory.com/listings1012942/how-much-you-need-to-expect-you-ll-pay-for-a-good-lasik-treatment