What is PRK or Epi-LASIK?

PRK or photorefractive keratectomy and Epi-LASIK are alternatives to LASIK when it is not possible or safe to make a corneal flap with a microkeratome. Like LASIK, these procedures reshape the cornea with an excimer laser to improve vision. However, instead of making a flap in the cornea, in PRK and Epi-LASIK the surgeon uses an instrument to remove only the very thin layer of surface cells, called the epithelium.

These cells regenerate quickly, over a period of 3-5 days in most cases. The excimer laser is then applied in the same way as in LASIK, to reshape the top of the cornea and refocus vision. PRK and Epi-LASIK are often called “surface ablation”, in contrast to LASIK which reshapes the middle layers of the cornea.

Surface ablation takes a few extra days to heal compared to LASIK, but preserves more tissue for people with thin corneas or high corrections. Also, surface ablation is recommended for law enforcement or military personnel who cannot adequately protect their eyes ... more.

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