this post was submitted on 18 Jul 2025
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The reason for widespread short-sightedness is unknown but the best study I read showed that kids playing indoor sports have significantly worse vision compared to the same outdoor sports.
My theory is because we look up close frequently, our eyes become adjusted to it. As a very near sighted person I can tell you, I see much better very close (a few inches from my eyes) than someone with 20/20, like magnification. Try it. I also used a screen probably 8 hours a day even since early childhood (lol, 90s parents).
We are really well adapted for pre-history and there's evidence we were happier and healthier back then (murder/rape was common, though). "Sapiens" covers this fantastically in general.
Some research postulates it's the lack of sunlight.