Do you remember when your parent ask you not to read or watch TV too close? I recently found out that short sightedness is caused by children who really read/see at close distance. Then the children are growing, their eyeball is growing too. When you read too near, the focus fall behind retina. Somehow, eyeball try to grow longer to compensate that. By growing long, it will fall at the retina. This long eyeball is on of the reason you have short sightedness. Because when your eye ball is long, your focus will fall in front of retina and your lens cannot focus it back to retina because your eye balls is too long.
For old people is ok because old people does not grow anymore.
That's why, listen to your parents.
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