bifocal glasses

bifocal

[bi´fo-kal] of a lens, having two areas with different refractive powers.bifocal glasses 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.

glasses

[glas´ez] lenses" >lenses arranged in a frame holding them in the proper position in front of the eyes, as an aid to vision" >vision. Called also eyeglasses and spectacles.bifocal glasses glasses with lenses" >bifocal lenses; see also bifocal glasses" >bifocal glasses.trifocal glasses glasses with lenses" >trifocal lenses.

单词	bifocal glasses
释义	DictionarySeeglassesEncyclopediaSeebifocal bifocal glasses bifocal [bi´fo-kal] of a lens, having two areas with different refractive powers.bifocal glasses 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. glasses [glas´ez] lenses" >lenses arranged in a frame holding them in the proper position in front of the eyes, as an aid to vision" >vision. Called also eyeglasses and spectacles.bifocal glasses glasses with lenses" >bifocal lenses; see also bifocal glasses" >bifocal glasses.trifocal glasses glasses with lenses" >trifocal lenses.
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