write the use of bi focal lens in correction for the defect of vision.
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It's used only when one suffers from Presbyopia
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this lens use in presbyopia
because in this person can not see clear near and far objects so this type of lens is used which upper part is concave lens and lower part is convex lens.
because in this person can not see clear near and far objects so this type of lens is used which upper part is concave lens and lower part is convex lens.
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