For the past several years using spectacles and contact lenses were the only remedies to correct refractive errors.  With the advent of Excimer laser another permanent method to correct refractive error came into being.

Excimer laser a cool laser is used to destroy intermolecular bonds in the corneal tissue resulting in tissue removal by a process called photoablative ecomposition.
           
Initially PRK (Photo Rrefractive Keratectomy) came into being.  In PRK excimer laser in applied after scrapping the epithelium.  Contact lens are used after the procedure till the epithelium heals.  Then Lasik (Laser in situ keratomileusis) was invented, where in the laser is applied after lifting a thin corneal flap.  The other techniques which have evolved over the years are Lasek where epithelium is removed and replaced after laser application and Epilasik where the epithelium is cut using microkeratome. 

In Lasik, the excimer laser is used to reshape the cornea  thereby correcting myopia, hyperopia and astigmatism.

We at Super Vision Lasik Laser Centre uses one of the most sophisticated excimer laser, the Allegretto Wave from Wavelight Technologies, Germany.
(www.allegrettowave.com)