Why does focusing on nearer things cause myopia? See if you're curious at even a basic level, you'd realize that there are important *details* about stuff like this where it actually helps to have some actual subject matter expertise and knowledge.
I believe during a certain age range your eyes determine they've grown to the correct size based on how well they focus, and ancestral humans mostly focused at far away things. When we spend lots of time indoors and looking at screens, our eyes adapt to this as the default focus. Since they're also evolved to look at things nearer than the default focus but not farther (since it's meant to be at infinity), this creates myopia.
That's a lovely theory, if quite imprecise in terms of the actual biology of eye development. The actually important part of science (the part that requires a lot of expertise and judgement) is figuring out how to make that an actually testable hypothesis and then whether or not its true.
direwolf20|12 days ago
bglazer|12 days ago