ELI5 LASIK - how exactly does it fix your vision?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

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

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