Question

Why do some people use Bi focal lenses

Answer 1

Those people who hv both problems of eyes: hypermetropia and myopia also known as presbyopia, use bi focal lens in which the upper part of a lens is concave and the lower part is convex Hope it helps.......

Answer 2

hi friend...

BI focal lens is usually used by old aged people...BI focal lens is a preventive method of presbyopia....usually some people have hypermetropia a and myopia... so it is used by them who can't see far point as well as near point.....

#HOPE THIS HELPS U...