An eye camp was organised by the doctors in a village. They found that the eyes of aged people in the village have the near point receded and the far point also gets reduced. Often aged people suffer from both myopia and hypermetropia. Doctors (opthalmologists) provide these people spectacles of bi-focal lenses to correct the defects. The people were happy and grateful to the doctors.
Give any two causes of this defect.

Explanation

(a) Weakening of ciliary muscles
(b ) Reducing ability of the lens to change the curvature.