bifocal lens
bifocal lens (by-foh-kăl) n. a lens with two principal focal lengths: the upper part of the lens gives a sharp image of distant objects and the lower part is for near vision, such as reading. See also multifocal lens.
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In the field of optics, a lens is a device used for focusing or defocusing a beam of light. It is usually made from shaped glass. A de…
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bifocal lens