The lens-type commonly used for correcting presbyopia is ______.

Question

Question

This question was previously asked in

SSC CHSL Previous Paper 23 (Held On: 10 Jul 2019 Shift 2)

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Answer 1

CONCEPT:

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 loosing power of accommodation.
It can be removed by using a bifocal lens. In bifocal lense

EXPLANATION:

Presbyopia is caused as part of the natural aging process of the eye.
Presbyopia can be corrected by using bifocal lenses. Therefore option 2 is correct.
The upper half of each lens is diverging and corrects myopia when the wearer is looking ahead at distant objects.
The lower half of each lens is convex and corrects the defect when the wearer looks through this part while reading.

NDA chapter test 10 prabhu D1

Defects of Vision	Details	Corrections
Hypermetropia or Farsightedness	The human eye can see distant objects clearly but cannot see nearby objects clearly.	Convex Lens
Myopia (short-sightedness)	The human eye can see a nearby object clearly but cannot see far away object clearly.	Concave lens
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