bifocal glasses

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Related to bifocal glasses: trifocal glasses


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.


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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
References in periodicals archive ?
The best solution, said Anshel, is "occupational progressives," which are glasses that provide correction for near and intermediate viewing rather than the near and far viewing of normal bifocal glasses.
"However, depending on the sport, bifocal glasses can make intermediate-range hand-eye coordination difficult.
Traditional bifocal glasses have a divided lens with the bottom area adapted for close-up viewing.
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.
Do you have a parent or grandparent who wears bifocal glasses? Do you secretly spy up at the clock during school to see how long until lunchtime?
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.