Question

Which eye defect can be corrected by using bifocal lens consisting of a both concave and convex lens?

Answer 1

presbyopia defect can be corrected by bifocal lens

Answer 2

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The eye defect which can be corrected by using bifocal lens consisting of both concave and convex lens is presbyopia.

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Why is a bifocal lens necessary for some persons in old age?

1. Some people, in old age, suffer from myopia (nearsightedness) as well as hyoermetropia (farsightedness).

2. Myopia is corrected using a concave lens of appropriate power. Hyoermetropia is corrected using a convex lens of appropriate power.

Therefore, they need a bifocal lens.

Hope it helps!

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