I Read That PRK or LASIK Treatment Burns the Cornea, Does It Grows Back to Its Normal Size?

I read in websites and heard from a specialist that PRK or LASIK treatment burns the cornea and basically "chops" the cornea until the visionn is corrected. I wanna know if after it burns the cornea grows back to its original shape?, could I have a second laser surgery after the first one, even with a cornea burnt with the laser?. I have astigmatism and myopia, and im really tired of my vision, Im starting to be unable to live without my glasses on, :( Thank you