• tfw_no_toiletpaper@lemmy.world
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      1 year ago

      OP is right, nearsightedness has been attributed to “not being outside enough” while your eyes still develop (aside from genetics of course), something to do with not getting bright enough sunlight for multiple hours as you are supposed to.

    • psud@lemmy.world
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      1 year ago

      There are a few ways to have bad eyesight

      • Short sighted, can only focus close up
      • Long sighted, cannot focus close up
      • Poor acuity, cannot see the detail others can see
      • Colour blindness

      It looks like most of the short sightedness is caused by lifestyle since it is much more prevalent in places where children spend a lot of time indoors

      The others would have affected our ancestors as much as us