Question

What is presbyopia? state it's cause.how it is corrected

Answer 1

Hola mate!!!!
It is the defect to which an old person cannot see the nearby objects clearly due to loss of power of accommodation of the eye.
CORRECTION :-
1)Use of both concave and convex lens of suitable power.
2)Sometimes a person may suffer from both myopia and hypermetropia
3)Such people require bifocal lens for correction.