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What is presbyopia? Which lens is used to correct it?

What is presbyopia? Which lens is used to correct it?An eye that suffers from myopia as well as from hypermetropia is said to suffer from presbyopia. A person with this defect cannot see objects distinctly placed at any distance from him. To correct this defect, a person is prescribed bifocal lens that has both types of lenses — convex and concave.

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