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Standard VIII
Physics
Question

Bi-focal lens are required to correct :
  1. Cataract
  2. Astigmatism
  3. Myopia
  4. Presbyopia

A
Astigmatism
B
Cataract
C
Myopia
D
Presbyopia
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Solution
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Presbyopia is a condition associated with aging such that the eye exhibits a progressively diminished ability to focus clearly on an object close to the eye.
Eyeglasses with bifocal or progressive additional lenses (PALs) are the most common correction for presbyopia. Bifocal means two points of focus: the main part of the spectacle lens contains a prescription for distance vision, while the lower portion of the lens holds the stronger near prescription for close work.

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