Refractive laser surgery
(correction of Myopia, Hyperopia, Astigmatism, Presbyopia)
Optical abnormalities of the eye
In a normal eye, the path of light rays is modified by the cornea and the lens to allow it to converge towards the retina. The myopic eye being too long, the light rays converge in front of the retina. The hyperopic eye is too short and the light rays converge behind the retina. The astigmatic eye presents anomalies of corneal curvature which create distortions of the retinal image at all distances. The presbyopic eye does not clearly distinguish close objects.
Why operate by refractive laser surgery?
Laser surgery consists in modifying the shape of the cornea, which makes it possible to modify the path of the light rays. It is intended to correct myopia, hyperopia, astigmatism and presbyopia. No more wearing glasses or contact lenses
How is laser surgery performed?
The intervention is performed while the patient is installed on the back in a surgical environment.
Hospitalization: the operation does not require hospitalization.
Anesthesia: the operation is performed under local anesthesia by instillation of eye drops.
Operative technique: different laser surgical techniques can be proposed. The method best suited to your particular case will be chosen with your surgeon.
What are laser surgical techniques for myopia intervention?
1. Photo Excimer Laser Surface Ablation (PRK)
After peeling the surface layer, the laser impacts are applied to the surface of the cornea. At the end of the intervention, a therapeutic lens or a dressing is put in place. This technique has been practiced since the 1990s. It can now be combined in some cases with pharmacological or physical treatments.
2. Photo excimer laser ablation in the thickness of the cornea (Lasik)
In this method, the laser is applied to the thickness of the cornea after surgical cutting of a flap of corneal tissue which is replaced at the end of the intervention. The Lasik operation has been practiced since the 1990s.
For myopia / hyperopia / astigmatism too strong to be corrected by laser, it is often rather advisable to do an operation with implants. (see below)
It depends on the surgical technique used.
1. The surface excimer laser
In the vast majority of cases, the operated eye is painful for approximately 3 days. The recovery of vision is rapidly progressive from the first week.
Local care is reduced to the instillation of gout associated with the possible taking of pain tablets. The methods and duration of wearing the therapeutic lens will be specified by your surgeon.
2. The Excimer intrastromal laser (Lasik) and Femtosecond laser surgery
In the vast majority of cases, the operated eye has little or no pain. Visual recovery is very fast.
Local treatments are reduced to the instillation of drops.
After any laser excimer photoablation surgery, the use of ultraviolet filtering glasses is recommended for approximately two months in the event of sun exposure.
The regulations concerning the visual skills of professions are continuously modified. he
It is therefore essential that you check yourself with the administrations concerned if a
refractive surgery intervention is accepted (army, police, gendarmerie, navy, fire department, SNCF,
air or road transport, etc.).
Source : SFO
Video PRK (Courtesy of dr Wong, MD)
Video Lasik (Courtesy of dr Wong, MD)