what is bifocal lense.?
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a mirror in which both concave and convex mirrors is present .
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Multifocal eyeglass lenses contain two or more lens powers to help you see objects at all distances after you lose the ability to naturally change the focus of your eyes due to age (presbyopia). Flat-top bifocal lens (also called a D-seg or straight-top). Executive bifocal lens (also called the Franklin bifocal).
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