I am a teenager and I still have perfect 20/20 vision. Now, I'm not expecting this to last, so I have a question.
How do you know when you need glasses? Do you just wake up one day, and your vision is blurry?
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Regular eye exams help. however, if you notice you're having trouble reading then that's normally the best sign. Also, if you start getting headaches from reading, or for no reason at all, that's a sign that one eye may be worse than the other.