Good Eyesight with the laser eye surgery
Can’t you or don’t you like to wear glasses? Don’t you accept lenses? Contrary to appearances, the percentage of population with eye defects and not tolerating corrective lenses is increasing permanently.
Luckily for them refractive surgery, one of the directions of ophthalmic microsurgery allows for partial or complete removal of eye disease. The most common corrected defects are myopia, hyperopia and astigmatism. The laser vision surgery is one of the most frequently performed procedures in ophthalmology.
We differentiate three surgical techniques:
PRK (photorefractive keratectomy) reshapes the cornea with minimized damage of the eye structures. Laser light damages the center front surface of the cornea. Reshaped cornea has changed curvature and thereby the trajectory of the light passing the eye and point of incidence of the light on the retina. PRK methodology helps to correct short-sightedness up to 6 diopters, astigmatism - up to 3 diopters and small hyperopia.
LASEK (Laser Assisted Sub-Epithelium Keratomileusis) is a kind of PRK. In this procedure the central corneal epithelium of the eye is separated before the laser treatment. Separation of the corneal epithelium is performed using 20% ethanol solution. Then, the laser ablates the corneal (like in PRK) and place the corneal epithelium on the eye back. The LASEK procedure in comparison with PRK is associated with less postoperative pain and with fewer complications.
LASIK (Laser-assisted in situ Keratomileusis) is currently the most common techniques of treatment of vision defects. It is more versatile procedure then LASEK or PRK and enables to correct short-sightedness up to 12 diopters, astigmatism – up to 5 diopters and hyperopia – up to 4 diopters. In this technique, like in LASEK, the corneal epithelium is separated, but it is performed mechanically using a special device, what prevents the effect of the chemical irritation of the eye surfaces.
Advantages of the method are: slight discomfort in the postoperative period, rapid visual rehabilitation and very low rate of complications.
The main postoperative complications include: dry-eye syndrome, keratitis, wrinkling or distortion of the removed corneal epithelium.
Contraindications to the performing of these procedures are:
- corneal diseases
- inappropriate secretion of tears and insufficiency of the eyelids
- advanced diabetes
- pregnancy and breast-feeding