Question

cause for myopia and corrective lens​

Answer 1

When your eyeball is too long from the cornea (the protective out layer of the eye).

✏️ The lights that enters in your eye it won't focus correctly.

✏️ Images which can focus in front of the retina, So the light sensitive part of your eye. Instead of directly on the retina.

corrective lens is concave of suitable power

Answer 2

too long size of eye ball

excessive curvature of eye lens

correct by concave of suitable power