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bifocal glasses |
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glasses /glass·es/ (glas´iz) spectacles; lenses arranged in a frame holding them in the proper position before the eyes, as an aid to vision. bifocal glasses those with bifocal lenses. trifocal glasses those with trifocal lenses. bifocal glasses Etymology: L, bis, twice, focus, hearth; AS, glaes eyeglasses in which each lens is made up of two segments of different refractive powers or strength. Generally, the upper part of the lens is used for ordinary or distant vision, and the smaller, lower section for near vision for close work, such as reading or sewing. Bifocal eyeglasses may be prescribed for presbyopia, which often occurs with aging. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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He was wearing bifocal glasses and must have shaved that morning. |
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