How to brighten your eyesight when it has graded?

Hi! I m sorry, I m not good in English, but I hope you can still understand. I hope someone can answer my question, does it possible to get back your healthy eyesight? I m just 14 yrs. Old and since I was 11 yrs. Old, my eyes is starting to get blurry when I look in far. And I think this is because of my teacher, she assigned my seat into the back of the class so I can t see clearly, is there any connection of it? June 2014, my mom and I go to ophthalmologist to do check-up, and now my grade is 300-300.

So, is it still possible to get back my healthy eyesight? What should I do? I hope someone can help me.

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