Question

what is presbyopia ?

Answer 1

the common defect associated with far -sightedness of old age when eye losses its power of accomodation [loss of elasticity} is called presbyopia

Answer 2

Hey friend here is your answer
The power of accommodation of the eye decreases as the weakness of ciliary muscles and lens uses it's flexibility with aging a person with presbyopia are not able to see near and distant objects clearly the correction of this defact is done by bifocal lenses in such lenses the lower part is convex and the upper part is concave lens
hope it's helps