What are the ways of changing the curvature of cornea?
The commonly used methods for refractive surgery are: PhotoRefractive Keratotomy (PRK) : It is being used less commonly nowadays. Laser-Assisted In-Situ Keratomileusis (LASIK) :This is the most popular form of Laser treatment. LASEK (or Epi-LASIK) :This newer form of treatment may be suitable in some selected patients with very high power. What is Excimer laser? Excimer laser is a far Ultra Violet (UV) light energy of wavelength 193 microns. It is invisible to human eye. This laser breaks the chemical bonds within the molecules (photoablation) with minimal thermal damage to the surrounding tissues. Thus it is very precise and can remodel the cornea with an accuracy of more than a thousandth of a millimeter. How does Excimer laser correct the refractive error? The effect of excimer laser on the cornea is very similar to grinding of a glass lens to change its refractive power. In eyes with refractive errors, excimer laser because of its high level of precision, can change the shape of th
