Lasik is common & very popular procedure for removal of glasses i.e, refractive error correction. In this procedure, a thin flap of cornea is raised first, followed by laser delivery over cornea to reshape it & lastly raised flap is repositioned back. Reshaping of cornea done by laser changes the power of cornea which in turn results in removal of power of glasses. How much of laser & where exactly over the cornea laser is to be delivered is determined by the computer. Therefore, mostly the results of lasik are very accurate & highly reproducible. But if a eye behaves differently to laser than most of the normal population, then some refractive error may still be present after lasik.
Corneal topography,corneal thickness & retinal status are most important thing determining if a patient is suitable candidate or not for lasik.
Patients with very high power of glasses, thin cornea, dry eye or weak retina may not be fit for lasik & in such cases alternative procedures like ICL / IPCL may be more suitable.
Though lasik is very safe procedure but like any surgical procedure, there are many possible (though uncommon) complications, a few of them can be serious also.
Modifications of Lasik:
There are many variations in lasik surgery also like wavefront guided lasik or C-lasik, Epilasik, lasek & femtosecond laser (Blade free lasik) and SMILE.
Femtosecond laser is the modification of lasik in which corneal flap is cut with the help of laser instead of microkeratome blade.