bifocal


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Related to bifocal: bifocal glasses

bi·fo·cal

 (bī-fō′kəl, bī′fō′-)
adj.
1. Having two focal lengths.
2. Having one section that corrects for distant vision and another that corrects for near vision, as an eyeglass lens.
3. Having two distinct goals or objects of attention: a bifocal approach to the problem.
pl.n. bi·fo·cals (bī′fō′kəlz, bī-fō′-)
Eyeglasses with bifocal lenses.

bi·fo′cal·ism n.

bifocal

(baɪˈfəʊkəl)
adj
1. (General Physics) optics having two different focuses
2. (Medicine) relating to a compound lens permitting near and distant vision

bi•fo•cal

(baɪˈfoʊ kəl, ˈbaɪˌfoʊ-)

adj.
1. having two foci.
2. (of an eyeglass or contact lens) having two portions, one for near and one for far vision.
n.
3. bifocals, bifocal eyeglasses.
[1885–90, Amer.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.bifocal - having two foci; "bifocal eyeglasses"
optics - the branch of physics that studies the physical properties of light
central - in or near a center or constituting a center; the inner area; "a central position"
Translations
ثُنائي البُؤْره
bifokální
bifokal
bifokális
tvískipt gleraugu
dviejų židinių
bifokāls
bifokálny
çift mercekliiki odaklı

bifocal

[ˈbaɪˈfəʊkəl]
A. ADJbifocal
B. N bifocalsgafas fpl bifocales

bifocal

adjBifokal-
n bifocals
plBifokalbrille f

bifocal

(baiˈfəukəl) adjective
(of lenses) having two points of focus, which help people to see things close at hand and things far away.

bi·fo·cal

a. bifocal, referente a dos focos o enfoques.

bifocal

adj bifocal; npl (fam) lentes mpl or gafas bifocales, bifocales mpl or fpl (fam)
References in periodicals archive ?
No matter how colorful or funky your frames are, switching back and forth between your reading glasses and eyeglasses or that visible bifocal (doble vista) line can still make you feel outdated and older.
50 index across single vision, HD SV, 1RS bifocal and free-form progressive lens options.
Another way to help see that pesky front sight on a pistol with aging eyes is to use a low-powered flattop or lined bifocal set or a higher-than-normal lens in the shooting eye side.
I personally had bifocal cataract implants placed into my eyes (Crystalens HD).
Thus, Hafed's team thinks of the 'lens' in the SC more as bifocal glasses.
To bring the reticle into sharp focus, the bifocal wearer has to view it through the lower portion of the eyeglasses, and that means raising or tilting one's head.
Bret custom grinds a lined bifocal directly into the upper part of the lens.
Their bifocal LASIK procedure, which can often completely eliminate the need for glasses after laser vision correction, has become one of the most popular surgeries among middle-aged patients in the past fifteen years since it was adopted by this laser center.
There's a lens grind called the "mechanics grind" (at least by some vendors) featuring a bifocal correction at both top and bottom of the lens with distance vision in the middle.
For example, insurers and their commercial policyholders need to apply bifocal vision to cyber risk.
Lens type Best for Details Single Correcting near vision Enable you to focus on vision reading material and close work such as embroidery; half- eye frame designs sit lower on the nose and allow you to more easily look into the distance over the top of the frame Bifocals Correcting near vision with A small portion of the some distance correction as lens is reserved for needed near vision correction; the rest of the lens incorporates a distance correction if required Trifocals Vision correction at near, Similar to bifocals, but intermediate and distant points with an added segment of focus above the bifocal for viewing things in the intermediate zone (about arm's length away), for example, a computer or the dashboard of your car
You can opt for bifocal and multi-focal versions but that will ratchet up the price.