Question

what is myopia?? what are reason for this defect? ​

Answer 1

Answer:

Myopia occurs when the eye has too much focusing power, either due to the eye being too long or the cornea being more curved than usual making the eye too strong.

Answer 2

Myopia is caused by the shape of the eye; either the eyeball is slightly too long or the cornea (the clear covering of the front of the eye) is too steeply curved. Myopia is corrected by spectacles or contact lenses with lenses which are 'minus' or concave in shape