ELI5 Myopia - why can’t you buy myopia glasses off the shelf like reading glasses?

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

How common is myopia around the world? Is it caused by genetics or lifestyle? How has myopia evolved with human activities? In aAmerican drug stores you often see a wide variety of reading glasses. Why are there no pre made options for myopia or near sighted people?

... 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: notofyourworld, forams__galorams, cultish_alibi, pearlsb4pigs, explosivelydehiscent, norrisn and queltis6000

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