LASIK (Laser-Assisted In Situ Keratomileusis) is eye surgery performed by an ophthalmologist who uses lasers to reshape the eye's cornea to improve focus. For patients with myopia (nearsighted), hypermetropia (farsighted), and astigmatism, LASIK surgery provides a permanent alternative to eyeglasses or contact lenses. This procedure is performed with two lasers making it a bladeless procedure. A femtosecond laser is used to make the corneal flap and an excimer laser is used to reshape the curvature of the cornea.
Photorefractive keratectomy (PRK) and Laser-Assisted Sub-Epithelial Keratectomy (LASEK) are laser eye surgery procedures to correct a person's vision, reducing dependency on glasses or contact lenses. PRK and LASEK permanently change the shape of the anterior central cornea using an excimer laser to ablate (remove by vaporization) a small amount of tissue from the thickest part of the cornea at the front of the eye, just under the corneal epithelium. The outer layer of the cornea is removed prior to the ablation.
With PRK, the corneal epithelium is removed and discarded, allowing the cells to regenerate after the surgery. The procedure is distinct from LASIK, a form of laser eye surgery where a permanent flap is created in the deeper layers of the cornea.
Femtosecond-assisted refractive lens exchange
Clear lens extraction is a vision correction surgical procedure intended to reduce or eliminate the need for glasses or contacts for people over the age of 50 in cases where laser refractive surgery is not an option. Similar to cataract surgery, this procedure involves removing the natural lens of the eye and replacing it with an artificial intraocular lens (IOL) implant such as a multifocal IOL implant, a phakic IOL, or an accommodating IOL.