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1) We can make him understand the need for wearing glasses. Talking about his eye defect(Myopia) we can tell him the possible reasons why he is facing such problem. We can also tell him that wearing glasses won't result in the downfall of his "cool image" because each part of the body is god gifted.
2)We can tell remind him how much his parents,teachers and others hope that he would get a good grade and since he has a weak eyesight he cannot do well in studies because it might strain his eyes and the condition might be more serious later.
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