bifocal glasses


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Related to bifocal glasses: trifocal 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 arranged in a frame holding them in the proper position in front of the eyes, as an aid to vision. Called also eyeglasses and spectacles.
bifocal glasses glasses with bifocal lenses; see also bifocal glasses.
trifocal glasses glasses 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.
References in periodicals archive ?
Some bifocal glasses slip down sweaty noses at the gym, or clash with dress-up clothes.
When people 55 and older date, they're looking at the relationship through bifocal glasses rather than rose-colored ones.
Washington, Jan 12 (ANI): Bifocal glasses can prove effective in slowing down the progression of myopia in children with high rates of progression, according to a new study.
Like bifocal glasses, they are designed to help people see objects in the distance more closely as well as being able to read small print.
NEW contact lenses were launched yesterday in a move which may change the lives of millions who wear bifocal glasses.
an associate professor in the School of Optometry, bifocal glasses can prove handy, but for those who wear contacts, presbyopia has been an annoying part of aging.