ELI5 LASIK - how exactly does it fix your vision?

What exactly is LASIK, and how does it differ from other vision correction procedures? Is it painful? How does it differ from PRK as a procedure? How does the cornea heal after a LASIK procedure if there is no blood flow going to the cornea? Which celebrities have famously had LASIK surgery? ... we explain like I'm five Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: aggressive_elevator, razzbaronz, vladimyrputin, just_a_pyro, lakefargo and iamkeerock To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Join us on Twitter: https://www.twitter.com/eli5ThePodcast/ or send us an e-mail. ELI5ThePodcast@gmail.com