trifocal


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tri·fo·cal

 (trī-fō′kəl, trī′fō′-)
adj.
1. Having three focal lengths.
2. Having one section that corrects for distant vision, a second section that corrects for medium vision, and a third that corrects for near vision, as an eyeglass lens.
n.
1. A lens having three focal lengths.
2. trifocals Eyeglasses having trifocal lenses.

trifocal

adj
1. (Mathematics) having three focuses
2. (General Physics) having three focal lengths
n
(Medicine) (plural) glasses with trifocal lenses

tri•fo•cal

(traɪˈfoʊ kəl, ˈtraɪˌfoʊ-)

adj.
1. (of a lens) having three foci.
2. (of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision.
n.
3. trifocals, eyeglasses with trifocal lenses.
[1945–50]
Translations

tri·fo·cal

a. trifocal;
___ lenseslentes ___ -es.

trifocal

adj trifocal
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References in periodicals archive ?
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.
PanOptix, the implant is a trifocal lens offering a full range of vision - near, intermediate and distant vision," he explained.
s - 10 sets; 01004 trifocal, Rear chamber, Aspherical soft intraocular lens - monoblock with optic design to prevent the development of secondary cataracts with a filter for the harmful part of the blue spectrum of light.
Or perhaps he's wearing trifocal lenses in his glasses-counting the eyes separately?
They employed trifocal tensor geometry information and multi-state constraint Kalman filter in the algorithm architecture to reduce the time consuming and enhance the accuracy of the algorithm.
It is not unusual for offenders to spend years at SCI-Cambridge Springs translating doctors' orders into the proper prescriptions for single vision, bifocal, trifocal and no-line progressive eyeglasses.
Moreover, the autonomous technology driving GM's electric vehicle is considered pretty standard, with lidar sensors similar to Google's car and a trifocal camera setup.
Visual outcomes and subjective experience after bilateral implantation of a new diffractive trifocal intraocular lens.
If we use the term 'refractive surgery' however, we can also include other ways to help you get rid of glasses (near and distance) with the options of KAMRA presbyopia inlay -- it is a safe, proven and lasting solution to correct presbyopia and restore your everyday near vision, ICL (implantable contact lens) and Toric ICL, multifocal IOL, trifocal IOL, and Crystalens accommodating IOL can be used for patients for whom the traditional laser methods are unsuitable or who are reaching the presbyopic age and cataract surgery may be looming -- my other surgical passion.
42) It was shown that bifocal or even trifocal distraction areas speed up the lengthening time, (66,67) but the regenerated bone needs sufficient time to become mature afterward.
Recognizing that good governance is imperative to national development, Education Nation 2016 pushes for the passage of the freedom of information bill and a congressional review of legislation on the trifocal education system, the National Coordinating Council for Education, and the institutional mandate of the Professional Regulation Commission.
Bifocal osteosynthesis was done in 3 cases and trifocal osteosynthesis was done in 1 case with corticotomy at 2 sites.