Two. A vacuum ring is put across the cornea, which serves to stabilize the eyeball and likewise functions for a System for that microkeratome. When vacuum is activated, the eyesight will become hazy and tension on the attention is felt. Secure Vision: Candidates should have a stable eyeglass or Call https://theidirectory.com/listings13458061/the-fact-about-lasik-eye-surgery-that-no-one-is-suggesting