What is Presbiopia and is correction
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Presmyopia is a defect happens due to aging.. In this defect ciliary muscles lose their ability to adjust the the focal length of an object. Using bifocal lens which is a concave and a convex lens of suitable power is the correction for this defect
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Presbyopia is a eye defect caused due to gradual weakening of the ciliary muscle and diminishing flexibility of eye lens of aged people.
the person suffering from presbyopia may suffer from only hypermetropia or both hypermetropia and myopia.In the first case the person can use convex lend and in the second case the person use bifocal lens(have both concave and convex lens)
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