Solutions

PKR (Photokératectomie Réfractive)

PRK, using the excimer laser technique was first used and has been widely used since 1993.

It is to reshape the cornea by applying the laser directly onto the surface of the eye after removing the surface layer (epithelium). The operation is performed under local anesthesia, it is painless. Its duration is short (few minutes). The surgeon first removes the epithelium by scraping. He then access to a deeper layer, the stroma, which represents 90% of the thickness of the cornea on which it will apply the excimer laser with high accuracy. Each impact removes corneal thickness of 0.2 microns (thousandths of a millimeter) over an area of ​​1 to 2 millimeters. The number of impacts is calculated by computer and varies depending on the size of the anomaly to be corrected. To correct myopia, the center of the cornea is well dug on an area of ​​5 to 7 millimeters (optical zone) and a depth of 120 microns or less. Become less curved cornea allows light rays reach the retina. Myopia is corrected as well.

PRK is effective for correcting myopia up to 6 small or medium diopters and astigmatism up to 3 diopters. Many experienced surgeons to reserve the medium or low myopia.
The disadvantages of excimer laser surface lie in the potential pain that may exist for 72 hours while the epithelium and completely rejects the possibility of a scar corneal haze (haze) may delay visual recovery. This veil is usually minimal, but in rare cases it may be dense enough to impair vision for several months. Other side effects and risks of PKR are broadly the same as for Lasik.

The advantage of the excimer laser surface remains the lack of cutting the corneal flap. It remains a solution if the cornea is too thin to be treated with Lasik.

The postoperative course is longer than for LASIK, healing requires 3-5 days, the visual recovery a week, falling even return to work.

After surgery excimer laser, the lenses filter out ultraviolet rays is necessary for several weeks in case of sun exposure. The stabilization of the vision may take several months.

LASIK "ALL LASER" with Femto-seconde laser

This laser can practice on all types of corneal incisions or cutting sheet metal.

For the Lasik operation by the use of the laser pushes even further advances in refractive surgery: Compared to the mechanized cutting surface by micro-keratomes, the laser provides unprecedented accuracy to date. The thickness of the cover is adjustable to 10 microns, this thickness is very regular. The boundary is well marked circular which allows a more accurate replacement of the hood.

Using this new laser coupled to the excimer laser offers a new approach to the surgery becomes far less "surgeon-dependent" in the surgery.

This technique "all laser" further improves the technique of Lasik, which already gave good results. The same requirements, however, remain regarding the limitations to the thickness of the central cornea but the possibility of covers only 90 microns thick further enhances security.

As for excimer lasers las, recent enhancements can improve the quality of vision obtained. Aspheric ablation profiles or programs that ablatent less corneal tissue or analytical instruments such as aberrometer.