2. A vacuum ring is positioned round the cornea, which serves to stabilize the eyeball as well as acts being a platform with the microkeratome. When vacuum is activated, the eyesight gets hazy and tension on the attention is felt. Undercorrections. In case the laser removes way too small tissue https://directoryrelt.com/listings1061820/lasik-eye-surgery-things-to-know-before-you-buy