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What is it? Eye surgery in which the surface of the cornea is reshaped using a laser, performed to correct certain refractive disorders to decrease the dependency on glasses or contact lenses
LASIK Eye Surgery
Physics of the Eye The doctor must measure the curve of the cornea, the size and position of the pupils, the shape of the eyes , and the thickness of the cornea in order to determine whether or not the patient is eligible for the procedure.
Requirements -in most cases, 18 years + -Stable vision for one year -Must not have dry eye syndrome, autoimmune disorders, scarring, herpes, infections -Must not be nursing or pregnant -Should have good general health
RISKS -Dry eyes -Over or under treatment -Loss of vision -Sensitvity to light -Itchiness -Infection
Watch this video on how it works! http://www.youtube.com/watch?v=KVBXP6Pu7-o
PROCEDURE 1. Eye is numbed 2. A hinged corneal flap is created, using a microkeratome, on the outer surface of the eye to expose the underlying cornea. 3. Cornea is reshaped using a laser 4. The flap is replaced
Refraction The eye has multiple angulated surfaces that cause light to bend at these interfaces between: 1. the air and the front of the cornea 2. the back of the cornea and the aqueous humor 3. the aqueous humor and the front of the lens 4. the back of the lens and the vitreous humor When everything is working properly, light arrives at the retina in perfect focus. In nearsightedness, light rays become focused in front of the retina. In farsighted, lights rays become focused behind the retina.
Farsighted
Nearsighted
Normal
