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What type of lens is used in presbyopia?

Dear Student ,
We should use bifocal lens to rectify the problem of presbyopia .
This type of lens is a mixture of both concave and convex lens .Concave in the upper part and convex in the lower part .
Regards

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Bifocal lens.
the upper part of the lens is concave and lower part is comvex
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The person suffers from both myopia and hypermetropia . So Bigocal lens is used . The upper part consists of a concave lens and the lower part consists of convex lens
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The person having presbyopia must use a bifocal lens consisting of concave as well as a convex lens
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Biofocal lens
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