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Re:Gwern's Law: Ads cost you a tenth of your users by chrisdsaldivar on Thursday March 14, 2019 @04:34PM (#19393392)
Another reason to limit screen time for kids is to prevent developing nearsightedness. Although this is just anecdata, I was talking to my optometrist at my last appointment and he told me he's seen far more kids coming in with myopia than ever in his 30 years of practicing and he attributes it to kids spending too much time on phones and tablets.

edit: Here's an article from nature which compiles some research on the topic. https://www.nature.com/news/the-myopia-boom-1.17120

Re:Gwern's Law: Ads cost you a tenth of your users by scarface74 on Thursday March 14, 2019 @04:48PM (#19393549)
I was looking for research to say that is a myth. But from a trusted source: The American Optometric Association:

https://www.aoa.org/patients-and-public/eye-and-vision-probl...

Re:Gwern's Law: Ads cost you a tenth of your users by DuskStar on Thursday March 14, 2019 @06:21PM (#19394433)
I think there's more evidence that it's lack of bright light, not an excess of screen time, that can cause nearsightedness.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5976264/

Re:Gwern's Law: Ads cost you a tenth of your users by jacobolus on Thursday March 14, 2019 @08:30PM (#19395299)
My understanding of the current consensus among researchers is that nearsightedness is usually caused by (a) not focusing on distant objects enough, and (b) not being outside often enough in very bright light.

There’s no reason to believe that screens are inherently worse for vision than books, knitting, legos, or any other close work. Which is to say, any of these are only a problem to the extent they are crowding out outdoor time.

If you’re worried about it, get your kids out to the playground or walking around the neighborhood or hiking in the woods for a few hours every day.

Re:Gwern's Law: Ads cost you a tenth of your users by chrisdsaldivar on Thursday March 14, 2019 @09:15PM (#19395575)
I’m 24 man I ain’t even thinking about having kids; I’m just putting information out there. Tbf I spent nearly every waking moment of my childhood outside and I’m extremely near sighted. I can’t even see my laptop screen without my glasses.
Re:Gwern's Law: Ads cost you a tenth of your users by jacobolus on Thursday March 14, 2019 @09:26PM (#19395639)
That’s a bummer. Sounds like you might be one of the few people who would have still developed myopia 200 years ago.
Re:Gwern's Law: Ads cost you a tenth of your users by chrisdsaldivar on Friday March 15, 2019 @12:11AM (#19396441)
Yeah seems so; it's not too bad though. However, I have high index lenses and they bend red and blue light up or down if I look at the source from the top or bottom edge of my lenses. There's the interesting effect where dark red or blue text on a black background looks like its in 3D. The text even shifts when I move my head around. Honestly, I should really just get lasik; people I know that got it swear by it.
Re:Gwern's Law: Ads cost you a tenth of your users by vict00ms on Friday March 15, 2019 @02:31PM (#19402729)
Look into ICL...more expensive but reversible (among other advantages).
Re:Gwern's Law: Ads cost you a tenth of your users by tomc1985 on Thursday March 14, 2019 @11:56PM (#19396350)
Do they say the same for people who stare at screens a foot or two away?