But also, spending lots of time in full sunlight seems to be protective against nearsightedness
I’m curious about that. I suspect something like “I’d guess it’s because being lots in sun means you’re staring way less on tiny things very close to you not because UV is good for eyes” but I’m curious why you think this is case in the first place
My impression (I’m open to correction) is that studies have tried to tease out the influence of inside-vs-outside from time-spent-looking-at-books-and-screens, and they reliably find that the former makes a big difference in myopia, while the latter makes no difference at all (once you control for the former).
There’s some proposed mechanism involving bright light increasing dopamine in the retina, which in turn impacts myopia via [not sure what the pathway is] (example). I don’t know how strong the evidence is for that mechanism.
Anyway, if you or anyone else tries to make sense of this literature, I’d be interested in what you learn. :-)
Thank you that’s interesting. I’ll just note that UV != bright light (eg. when wearing corrective glasses you can have UV filter but no visible light filtering).
I’m curious about that. I suspect something like “I’d guess it’s because being lots in sun means you’re staring way less on tiny things very close to you not because UV is good for eyes” but I’m curious why you think this is case in the first place
My impression (I’m open to correction) is that studies have tried to tease out the influence of inside-vs-outside from time-spent-looking-at-books-and-screens, and they reliably find that the former makes a big difference in myopia, while the latter makes no difference at all (once you control for the former).
There’s some proposed mechanism involving bright light increasing dopamine in the retina, which in turn impacts myopia via [not sure what the pathway is] (example). I don’t know how strong the evidence is for that mechanism.
Anyway, if you or anyone else tries to make sense of this literature, I’d be interested in what you learn. :-)
Thank you that’s interesting. I’ll just note that UV != bright light (eg. when wearing corrective glasses you can have UV filter but no visible light filtering).
Oh lol I have good vision so forgot that glasses are a thing. Oops. Just added a footnote, thanks.