This article is from the Vision and Eye Care FAQ, by grants@research.canon.com.au (Grant Sayer) with numerous contributions by others.
There are basically 4 main operations performed for correction of refractive
errors:
+ Radial Keratotomy (RK)
+ Photo-Refractive Keratectomy (PRK)
+ Automated Lamellar Keratoplasty (ALK)
+ Laser Assisted Intrastromal Keratomileusis (LASIK)
 
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