Correcting myopia, hyperopia and astigmatism
These ocular conditions called "errors of refraction" (see section on "eye anomalies") can be corrected by 2 laser techniques: PRK and LASIK (95% of cases).
The principle is the same for both techniques: the excimer laser sculpts the cornea to change its shape (curvature). To correct myopia, the cornea is flattened. For hyperopia, the cornea is steepened. For astigmatism, the cornea is flattened along one axis, and steepened along the other.
✓ Customized Lasik with the Schwind Amaris laser
The Schwind Amaris is a latest generation laser approved by Health Canada in 2012. Clinique Laservue was the first in North America to acquire this technology. This laser has the most sophisticated eye tracker on the market, which follows your eye in "6-Dimensions" (see video below), thus assuring centration of the treatment even in the presence of microscopic eye movements during treatment. It is ultra-fast (500 pulses per second) and ultra-precise, and the vast majority of our patients achieve 20/20 vision the very next day.
✓ PRK (photo-refractive keratectomy)
PRK is an older technique than Lasik. Betwen 1992 and 1995, the Laservue surgeons performed over 4000 PRKs. The main disadvantage is that the outer skin of the eye must be removed before applying the excimer laser. The healing is thus much slower. We will still perform PRK in patients with corneas too thin for Lasik.
Transepithelial PRK: this new technology is unique to the Schwind laser. The outer layer of skin cells is removed by the laser itself in a more gentle and accurate way than with a blade or alcohol. Healing is thus faster than with traditional PRK. Laservue is so far the only clinic in Quebec to have this technology.
✓ "Phakic" Intra-Ocular Lens for high myopia
Implantation of an intra-ocular lens is a technique which can correct high myopia in adults who are not candidates for laser surgery. The implant is positioned between the natural lens of the eye and th iris (ICL from Staar Surgical).
✓ Lens extraction and implantation of an intra-ocular lens
Lens extraction and implantation of an intra-ocular lens is generally performed in patients over the age of 50.
Indications may include:
• High hyperopia or myopia
• Presbyopia (with either monovision or a multi-focal implant)
• Opacification of the natural lens (cataract)
A small incision is made in the cornea, and the natural lens is then pulverized with ultrasound and aspirated from the eye.
The next step is to implant the intra-ocular lens of the correct power. The lens is made of acrylic, a soft and flexible material that was specifically developed for the eye.
The implant may correct at a single distance (monofocal) or at several distances (multi-focal). Also, both types of lens can also correct astigmatism.