Question

What is presbyopia ? What causes Presbyopia & how is it corrected ?

Answer 1

Presbyopia is that defect of human eye due to which an old person cannot read and write comfortably .That is why presbyopia is also called old sight
To corrected presbyopia an old person has to use spectacles with a convex lens of suitable length or power as explained already

Answer 2

Here is your answer..

What is Presbyopia ? 

Presbyopia is the defect of vision. During this, people find it difficult to see the nearby objects clearly and comfortably without their spectacles, Because the near point of the lens shifts farther from the eye.Hence old people cannot see nearby objects clearly.

This defect can be corrected by using a convex type of lens of suitable focal length. 

This is all about Presbyopia.