13.7 LASER EYE SURGERY
• Laser eye surgery is a common procedure used for vision correction and is a widely advertised alternative to glasses and contact lenses. This procedure is used to correct refractive errors by reshaping the cornea of the eye so that sunlight hits the retina of the eye in a different fashion. The laser commonly used in this procedure is known as Excimer laser.
Reasons for requiring surgery include:
Hyperopia: (farsightedness) Occurs when the curvature of the cornea is too little or the eyeball is too short making light focus behind the retina instead of on the retina.
Astigmatism: Occurs when the cornea is not smooth or evenly curved preventing light from focusing evenly on the retina.
There are many different types of laser eye surgery. The major types used in Canada include:
PRK (Photo-Refractive Keractectomy): In this procedure an excimer laser guided by a computer, is used to reshape the surface of the cornea
LASIK (Laser Assisted in Situ Keratomileusis): This procedure is done by cutting a circular, thin flap in the cornea with a fine blade and removing calculated amounts of the underlying tissue with an excimer laser guided by a computer, the flap is then closed and the eye heals naturally. The eye heals faster with this procedure than with PRK
LASEK (Lasek Epithelial Keratomileusis): In this procedure the epithelium (the outer layer of the cornea) is removed with a fine blade, then, alcohol is used to loosen and lift it in a single layer. The underlying layer is treated. When the treatment is finished, the epithelium is placed back and a bandage contact lens is used to keep it in place as it heals which takes about two weeks.
Epi-LASIK: Similar to a LASEK procedure except the epithelium is removed with a blunt plastic tissue separator instead of a sharp blade and a suction ring is placed over the eye to keep it in place.
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