A bifocal lens is used as a remedy in which of the following defects in the eyes?

Question

Question

Answer 1

CONCEPT:

Defects of Vision	Details	Corrections
Myopia (short-sightedness)	The human eye can see a nearby object clearly but cannot see far away object clearly.	concave lens
Hypermetropia or Farsightedness	The human eye can see distant objects clearly but cannot see nearby objects clearly.	Convex Lens
Presbyopia	In this defect, both near and far objects are not clearly visible. It is an old age disease and it is due to the losing power of accommodation.	Bifocal lenses
Astigmatism	In this defect, the eye cannot see horizontal and vertical lines clearly, simultaneously. It is due to the imperfect spherical nature of the eye lens.	Cylindrical lens

Explanation:

When the eye lens becomes less elastic then it happens.
When the Objects nearby appear to be blurred to a person then it is called Presbyopia.
Due to presbyopia, the ciliary muscles of the eye lens becomes weak and the visual defect started.
So option 2 is correct.