Laser EYE SURGERY
 
LASIK and Excimer Lasers
 
Michael Hutchins
 
 
The PROBLEM
 
pia - near sightedness
 
sed by either an elongated or steep cornera.
 
focal point is in front of the a instead of on it.
 
cally corrected with concave ativeoticalowerlenses.
 
THE PROBLEM
 
eropia - far sightedness
 
ed by a flat cornea or rt eye.
 
l point is behind the a.
 
ected with concave s (positive optical
 
THE PROBLEM
 
matism arises from different focal points in different es of the eye.
 
sed by non-uniform curvature of the cornea or scarrilens.
 
ular astigmatism cannot be fixed by glasses, just cont
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