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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You go blind, and you must go to a hospital. There, leeches will be placed under your eyelids to suck the fuzz out. In seriousness, you never know at first, the eye doctor just tells you at your check-up.