Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Having two focal lengths.
- adjective Having one section that corrects for distant vision and another that corrects for near vision, as an eyeglass lens.
- adjective Having two distinct goals or objects of attention.
- noun plural Eyeglasses with bifocal lenses.
from The Century Dictionary.
- Having two foci.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Having two foci, as some spectacle lenses.
- noun a bifocal lens.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective optics Having two
focal lengths - adjective of a correcting lens Divided into two parts, one of which corrects for
distance vision and the other fornear vision
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective having two foci
Etymologies
Sorry, no etymologies found.
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Examples
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He produced other inventions as well, such as bifocal eyeglasses and the efficient Franklin stove.
Franklin, Benjamin 2002
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No intermediate lenses but u get optimal distance correction as well as reading. .and u will also look younger with them glasses as they don't have the telltale "bifocal" line.
Home Theater Forum 2010
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If not, then you got something "off the rack", and it may just be that the "bifocal" part covers more of the lens than necessary.
Home Theater Forum 2010
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I've got progressive bifocals, and the "bifocal" part occupies
Home Theater Forum 2010
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If not, then you got something "off the rack", and it may just be that the "bifocal" part covers more of the lens than necessary.
Home Theater Forum 2010
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(progressive or otherwise) wherein the "bifocal" part occupied the entire bottom half of the lens, and they swore they'd never go back to bifocals again.
Home Theater Forum 2010
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I've got progressive bifocals, and the "bifocal" part occupies a small semi-circular region at the bottom of the lens, and I have clear vision throughout the rest of the lens for distant objects (no "sweep spot).
Home Theater Forum 2010
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Pastor White is fifty-something with receding brown hair that he combs straight back, and wears large bifocal glasses that cover half his bearded face.
American Grace Robert D. Putnam 2010
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Watch Your Step Dr. Auerbach notes that wearing bifocal glasses to correct the classic over-50 vision issue—presbyopia, or the inability to focus on objects nearby—can lead to stumbles and falls; the lower part of the glasses, meant for reading, can blur the image down at your feet.
Remedies for the Road Laura Landro 2011
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Our leaders must become bifocal, if not bipartisan.
Ed Crego, George Muñoz and Frank Islam: The Need for Austerity and Audacity Ed Crego 2011
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