La Chirurgie Réfractive
Photorefractive keratectomy (PRK) is laser eye surgery procedure intended to correct a person's vision, reducing dependency on glasses or contact lenses. PRK permanently change the shape of the anterior central cornea using anexcimer laser to ablate (remove by vaporization) a small amount of tissue from the corneal stroma at the front of the eye, just under the corneal epithelium. The outer layer of the cornea is removed prior to the ablation and will rapidly regrowing from limbal stem cells within a few days with no loss of clarity. The deeper layers of the cornea, as opposed to the outer epithelium, are laid down early in life and have very limited regenerative capacity. The deeper layers, if reshaped by a laser, will remain that way permanently with only limited healing or remodeling.
LASIK (laser-assisted in situ keratomileusis) is a type of refractive surgery for correcting myopia, hyperopia, and astigmatism. LASIK is similar to other surgical corrective procedures such as photorefractive keratectomy, PRK. It provides benefits such as faster patient recovery, thought the surgical risks are increased. Both LASIK and PRK represent advances over radial keratotomy in the surgical treatment of vision problems, and are thus viable alternatives to wearing corrective eyeglasses or contact lenses for many patients.
More information is available on Wikipedia.org
Comparaison PRK-LASIK dans les cornées fines (Eurotimes, vol 16, 2011)
Comparaison PRK-LASIK en pratique pour le patient