Question

What is presbyopia? How can the defect in the presbyopia be corrected?

Answer 1

The vision defect in which a person cannot see near by object and distant object clearly is known as presbyopia.

This defection can be correct by using concave and convex lens.

Answer 2

presbyopia is a common defect of vision which generally occurs at old age . A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively .A presbyopia eye has its near point greater 25 cm and gradually increases as the eye become older. this arise due to weakening of the ciliary muscles.

to remove this defect we use a focal lense which contain both concave and convex lense.