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PRK (Photo Refractive Keratektomy) and its advancement, LASEK (Laser Epithelial Keratomileusis), are generally meant to treat certain groups of patients. Among these are nearsighted patients who are not suitable for LASIK/FEMTO-LASIK, e.g. due to thin corneas.
PRK and LASEK are among the surface techniques. Thus, the corneal epithelium is pushed aside or removed first, mechanically (PRK) or with a special scraper (LASEK). In contrast to the LASIK / FEMTO-LASIK, in which a complete corneal flap is generated, a thin layer of corneal epithelium is remained in PRK / LASEK.
With the excimer laser, the cornea is ablated to a certain thickness with the excimer laser – on the basis of the measured values at the preliminary eye examination. The refractive power of the cornea is thereby changed, so that incoming light rays now bundle correctly on the retina – a sharp visual image is created.
Finally the corneal epithelium is pushed back and the cornea is covered with a protective contact lens. The first 3 to 5 days the contact lens protects the epithelium that has yet to heal, and is then removed. It may take two to three months until the stability of vision is attained.
PRK (Photo Refractive Keratektomy) and LASEK (Laser Epithelial Keratomileusis) are fallback procedures and should only be preferred to LASIK/FEMTO-LASIK in special cases.
As mentioned before, PRK or LASEK are only fall-back procedures. For this reason, EuroEyes generally only carries out this treatment with patients that have very thin corneas or particular professional reasons, and therefore can’t go through with LASIK/FEMTO LASIK. Furthermore, the treatment options for LASEK or PRK are limited. As a rule, only myopia up to -6 D and astigmatism up to max. 3 D can be corrected. The correction of presbyopia is not possible.
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