Question

how miopia is occured?how to cure it?

Answer 1

hey friend,
I guess you mean to say myopia,
so talking about it, myopia is caused either due to the lengthening of the eye ball or due to the lens been too curved or in some cases even both.
It can be rectified by the use of a concave lens.
hope it helps you.....!!

Answer 2

Myopia occurs when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye. This causes light rays to focus at a point in front of the retina, rather than.
When light coming from distant objects is 'overfocused', so that the point of focus is in front of the retina.