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But I went outside a lot as a kid!

I read this article today and I'm a little bit annoyed. Basically, its saying that time spent outside helps to prevent nearsightedness. Something about natural light and all that stuff. Well, I'm -8 and spent a lot of time outside as a kid, especially during the formative years (ages 8-12) when my eyesight deteriorated the most. So it must be genetic in my case or what?

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