Question

name the defect of eye in which ciliary muscles weaken gradually due to old age

Answer 1

presbyopia defect of eye in which ciliary muscles weaken gradually due to old age

by anshu jurriya IITIAN

Answer 2

Presbyopia is an eye defect caused in old age.The person with this defect cannot see nearby objects clearly. This defect is caused because of the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens caused due to ageing.  

Convex lens of suitable focal length is used to correct presbyopia.