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Not sure if this is really true, but I heard that your eyes actually adjust to looking at whatever distance you look at most. Babies are born farsighted, then their eyes adjust and about elementary school age they go a little nearsighted. Then they have a bit of trouble reading the board and before ye know it they've got glasses. Which actually can make things worse as they make everything seem closer, so your eyes have to adjust more. It's especially bad if you get a prescription that's a bit too strong. I think that's what happened to me...I got a lot of too-strong prescriptions in elementary school, and now I can't see clearly further than six inches from my nose.
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