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When does a person wear a specs with both concave and convex lens?

Sajin John Asked:

When does a person wear a specs with both concave and convex lens?
Answer
:

A person uses bifocal lenses, while suffering from presbiopia.

Bifocals are eyeglasses with two distinct optical powers. Bifocals are most commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.

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