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Advanced Surface Treatment is sometimes referred to as photo­refractive keratectomy (PRK), LASEK or Epi­LASIK. These procedures have the following in common: Only a very thin layer of the surface of the cornea (the epithelium) is scraped off without creating a flap and then the excimer laser is applied to reshape the cornea. After the treatment, the recovery is somewhat prolonged, because the healing of the surface (or regeneration of new epithelium) is a slow process that can take several days.

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