As one meta-analysis put it:

It’s estimated that an increase of one hour per day of outdoor time could reduce the occurrence of myopia in children by 45%.

Make sure your kids spend time outside, folks!

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[–] 108 points 4 months ago (4 children)

I was outside a lot and still got myopia :3

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  • [–] 25 points 4 months ago

    Then you were likely genetically predetermined to be at least a little myopic, but if you spent less time outside during your developmental phases you would likely be even more nearsighted than you are now.

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  • [–] 21 points 4 months ago (2 children)

    Same for me, I spent most of my free time as a child playing outside. I grew up in California, weather wasn't a concern, I was outside year-'round. I got my first pair of glasses at age 21. I suspect it's far more genetic than environmental.

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  • [–] 11 points 4 months ago* (last edited 4 months ago) (1 child)

    It’s both. You can just look at the statistics, the number of people with myopia has gone up over the last few decades. If it was just genetics those numbers would have been stable.

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  • [–] 37 points 4 months ago (4 children)

    My eyes have been terrible since 1st grade. My prescription got as high as 9s.

    Then I got cataract surgery on one eye, and I can see nearly perfectly without glasses for the first time in my life. This summer, I'm getting the other one done, and I won't have to wear glasses anymore, for the first time in my life.

    Anyway, the point is: As I was talking to the eye surgeon, and mentioned my bad eyesight, he told me why: I have the eyeballs of a man who is 7'2" tall, jammed into my 5'11" skull. Apparently, I have enormous eyes, which nobody has ever mentioned to me, other than one brief girlfriend who used to comment on my gigantic green eyes.

    If I had to get something big from a 7'2" inch man, why did it have to be eyeballs?

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  • [–] [S] 5 points 4 months ago (2 children)

    Wow I didn't realize that cataract surgery can improve your vision that dramatically. I thought cataracts surgery was something typically reserved for seniors to prevent foggy vision

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  • [–] 13 points 4 months ago (8 children)

    Well, yeah, I'm old, and there were cataracts in both eyes, but one went bad real fast, over the course of a few months. The doc told me that it's kinda rare, but it happens. What was weird is that it only happened in one eye, so at least I could see with my one good eye, but if it happened to that eye too, before I could get the surgery, I'd be screwed. I literally wouldn't be able to see well enough to drive, read, anything.

    So the new lens corrected for any bad eyesight, more or less. I haven't had it tested now that it's fully healed, but it probably isn't perfect 20/20, but it's close. I have a contact in my other eye, which is still at a 9, so very bad. It also has a light cataract.

    Now I can see the difference between the two eyes. In my new eye, colors are brighter and sharper. In my other, cataract eye, colors are slightly, but noticeably muted. I probably wouldn't even have noticed it, if I didn't have the new eye for comparison.

    I've also noticed that late at night, when I'm tired but still watching TV, I get double vision. I have to consciously focus. The doc warned me that having a good eye, and a contact lens eye would mess with my vision, and I think this is what he was talking about.

    The doc said that now that I've had one done, the insurance will probably spring for the second one, even if it isn't necessary yet. That means I'll have nearly perfect vision, and maybe need reading glasses. I use reading glasses with my new eye, but if I don't have them, it isn't a big deal, I see well enough for most stuff.

    Sorry to yak so much about it, but It's kind of exciting, being able to see so well for the first time, as an old person, and I don't really have anyone else to tell it to that would care.

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    [–] 29 points 4 months ago (10 children)

    Hold up now. I grew up in the 80s when we spent the whole day outside, and I wore thick ass lenses all through grade school.

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    [–] 25 points 4 months ago (2 children)

    If you get this type of short sight vision, you can train your eyes to get the vision back as this is caused by the eyes strength.

    But if you have the type that has to do with your eye shape going outside will do nothing, and you can exercise it away

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  • [–] 11 points 4 months ago* (last edited 4 months ago)

    You need to read better. It says it reduces occurrence of myopia in a population not that it cures myopia when an individual gets it.

    Sure if you have very mild short term myopia caused by eye straining you can get vision back by training your eye. But with kids it’s about how the eye develops when it’s still growing. When kids eyes grow too fast they grow less spherical and that is what causes myopia and that is the kind that you can never cure. Going outside means kids are getting more sunlight in their eye which will slow down the growth and thus their eyes will grow more spherical which means they don’t develop myopia. Playing outside won’t cure myopia but it will reduce the chance of developing it in children.

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  • [–] 6 points 4 months ago* (1 child)

    Yes, I spent 6 months in ICU in 2014, I had a lot of eye issues while I was there not related to my reason for my stay (bilateral lung transplant) but as side effects of procedures and meds but I also basically lost my depth perception unless it was directly in front of me. Living in a 10x10 room for half a year with no far away distances to observe made my eyes weak, it took about six months after I got home to get my full depth prescription back. Indoors just makes your eyes weak, mine is an extreme example, but it doesn’t permanently ruin them.

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  • [–] 24 points 4 months ago
    [–] 21 points 4 months ago (1 child)
  • [–] 8 points 4 months ago (1 child)

    https://en.wikipedia.org/wiki/Myopia says that both terms exist in English? Not a native speaker; I think I have seen "nearsightedness" more often in English but my first language's term for it translates to "shortsightedness". 🤷‍♂️

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  • [–] 6 points 4 months ago* (4 children)

    IDK why it would say that, I'm a native speaker and the two terms have different meanings. Short-sightedness refers to not planning for long-term problems.

    Edit: looking at what comes up in search, I see it showing up that way. I guess words change if we use them incorrectly for long enough. I'd be awfully confused if someone started talking about my short-sightedness as anything other than a flaw in my problem-solving abilities.

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  • [–] 15 points 4 months ago

    I spent 90% of my early childhood outdoors. Didn't work.

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  • [–] 13 points 4 months ago (5 children)

    Is this really causation though? Could it not just be that kids that spend less time looking at screens are less likely to be short-sighted AND more likely to spend time outside?

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  • [–] [S] 7 points 4 months ago

    If this is just a correlation this would have to be a correlation at the population level. Countries where kids start school later on (e.g. 7 years old) have significantly lower rates of myopia than countries that start school early on in a child's development (e.g. 3 years old). It's still possible that this is a correlation, but the correlation would have to be capturing something deeper than just an individual kids screen time. Granted, this correlation would still need to account for differences between individual kids, but it would also need to account for differences between kids at a population level. It's hard to see what could be causing this correlation though. So maybe there's something there we're just not seeing, but at a certain point though the idea that there is a causal relationship starts to seem like the most plausible explanation for explaining this data

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  • [–] 6 points 4 months ago (1 child)

    It wasn't mentioned in this article, but I remember reading somewhere that it might be because exposure to sunlight affects vitamin D production, which affects the length/shape of our eyeballs as we're growing up.

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    [–] 12 points 4 months ago

    I'm farsighted, so I can only conclude that I spent too much time outdoors as a kid. See Mom!?

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  • [–] 10 points 4 months ago* (1 child)

    One hour of outdoor time per day is not a modest increase

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  • [+] 9 points 4 months ago* (last edited 1 month ago)
    [–] 9 points 4 months ago (1 child)

    I was outside a ton when I was younger and I still have myopia. These things happen.

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  • [–] 7 points 4 months ago*

    well, i can concur. my eyes have trouble adjusting to looking into the distance when i have spent hours in front of the screen. they adapt after a few minutes to hours though.

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  • [–] 7 points 4 months ago

    did not seem to help me. I guess I got the bad side of the coin flip.

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  • [–] 6 points 4 months ago

    but my electronic image generator makes bam bam noise, must spend more money for more RAM

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  • [–] 5 points 4 months ago (1 child)

    YSK: The word is 'spent' not 'spend'.

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    [–] 5 points 4 months ago (5 children)

    "Also, while various theories such as increased light exposure, release of dopamine from retina, increased depth of field have been suggested to explain the protective effect of outdoor time, the mechanism remains to be elucidated"

    Correlation is not causation.

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    [–] 5 points 4 months ago (1 child)

    LMFAO

    My mom blamed us (me and my older brother) for "sitting too close to the TV"

    She kept us mostly locked indoors in an apartment (besides going to school) from the beginning of my memory up till 8 years old.

    Then we moved to the US and from 8 to 12 I was in school from morning (like 7 AM maybe? forgot the exact time) till like 6PM cuz she signed me up afterschool programs cuz she wanted to use it as free babysitting essentially so she can work longer...

    And we cant go outside alone without adults.

    In China it was "a lot of kidnappers on the street thay will traffic you and sell your organs"

    In the US it was "if you go outside without an adult, CPS will take you away and you can't see mama again" (idk why mom spoke in 3rd person sometimes lol)

    Yay! so... from birth to 12 I was indoors, either in school or at home, most of the time...

    outdoor time was rare and only when parents have a day off or like the 15 minutes of recess in school...

    that's basically our outside time...

    In China we had maternal grandma that sometimes took us outside...

    In the US, it was just mom, dad, older brother, and me (cuz grandma can't come yet, no visa yet)... So we had even less outside time... like parenrs had to work all the time...

    But of course its always "too much screens!" to be blamed lmao

    From 8 to 12 was when my nearsightedness really developed a lot.

    I didn't understand why I had nearsigntedness at the time, but now looking back and analyzing my life, now it's so obvious why lol..

    My older brother has like -9.00 or -10.00 in the nearsightedness thing. Its funny my parents called it like 900 or 1000 "degrees".... like it sounds so much scarier when they drop the decimal point and literally say: "you're about to have ONE THOUSAND DEGREES IN NEARSIGHTEDNESS! You're gonna GO BLIND!"

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