correcting vision

Question 1

how are lasers used in surgery?

Answer 1

they are used to cut through body tissue instead of using a scalpel

Question 2

why do lasers cauterise small blood vessels?

Answer 2

this reduces the amount of blood being lost and also protects the patient against infection

Question 3

how are lasers used to treat skin conditions?

Answer 3

they burn off top layers of scarred skin

Question 4

eye surgery

Answer 4

• laser used to vaporise some of cornea which changes the shape
• changes the focusing ability
• which inc/dec the power of the cornea so the eye can focus images properly on the retina