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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What makes you believe that this condition will not last? Just get your eyes checked by an optometrist to know for sure. Everybody's eyes are different. Some need correction very young, others as they age, some are fortunate and have good vision all their life. Just wait until you need bifocals (hope you don't). They're a pain to get adjusted to.