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 ?
"In our opinion, the treatment effect of bifocal and prismatic bifocal lenses of 38 percent and 55 percent, respectively, in this study, though greater than those of others, is still modest.
A REVOLUTIONARY bifocal contact lens has been launched which allows the wearer to see without looking up and down, as with conventional glasses.
NEW contact lenses were launched yesterday in a move which may change the lives of millions who wear bifocal glasses.
Varying degrees of success have been reported for both bifocal and progressive addition lenses; in some cases success has been limited to subjects with large near esophoria, (20) large accommodative lags, (21-22) or rapid myopia progression rates.
The kit, called SeeingVR, includes 14 tools including a bifocal lens, a magnifier, controls for brightness and contrast, edge enhancement, and depth measurements, so a player can customise their experience, Engadget reports.
Recall that the patient wants bifocal lenses, and it is worth noting at this point that vertical differential prismatic effects can be generally worked out by consideration of the distance portion; if the segment size, heights, and additions are the same in each eye, then the vertical prismatic effects due to the segment cancel each other out.
So I contacted Tactical Rx, a Denver-based company specializing in "inverted bifocal" lenses and innovative frames for shooters.
For example, if you get a new prescription for glasses, or switch to wearing bifocal or trifocal lenses, it may take time for you to adjust.
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.
Mplus IOLs (312 MF30, 313 MF30, and 312 MF30) were used in the refractive rotationally asymmetric multifocal IOL group, and spherical monofocal (Acri.Smart 48S) IOLs, accommodating IOLs (Crystalens HD), and refractive-diffractive bifocal IOLs (Acri.Lisa 366 and ReSTOR SN6AD 1/3) were used in comparison groups.
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.