trifocal


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tri·fo·cal

(trī'fō-kăl),
Having three foci. See: trifocal lens.

trifocal

/tri·fo·cal/ (tri-fo´-) (tri´fo-k'l)
1. having three foci.
2. containing one part for near vision, one for intermediate, and a third for distant vision, as a trifocal lens.

trifocal

(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

1. Having three focal lengths.
2. Distance-viewing spectacles having additional segments for intermediate and close ranges.
References in periodicals archive ?
Ilizarov trifocal lengthening followed by intramedullary nailing for massive posttraumatic tibial bone defects.
because he had trifocal eyeglasses at that time, and was trying to decide what he wanted to focus on.
A third-order tensor usually called trifocal tensor captures the geometry among three views of a 3D scene.
M2 EQUITYBITES-June 17, 2015-Alcon's new trifocal presbyopia-correcting intraocular lens for patients undergoing cataract surgery receives European approval
M2 PHARMA-June 17, 2015-Alcon's new trifocal presbyopia-correcting intraocular lens for patients undergoing cataract surgery receives European approval
Henrik Lind, technical expert, Drive Me, Sensing System, Autonomous Drive, explains, "In the forward view, besides three radars [one in the rearview mirror mount and two in the front bumper] the Drive Me cars additionally have a trifocal camera and a laser scanner allowing detection of objects both on long and short range.
Trevor Dawson, of Brunton Park, Gosforth, is one of the first UK patients to undergo the trifocal lens implant procedure at the London Eye Hospital - at PS7,000 per eye.
Trevor Dawson, of Brunton Park, Gosforth, had a trifocal lens implant procedure at the London Eye Hospital - at PS7,000 per eye.
The automaker is continuing to develop its sensor systems, integrating multiple radar and sonar systems, trifocal cameras and multi-beam laser scanners to determine exact positioning and a complete view of the vehicle's surroundings.
This paper is part of the author's doctoral thesis, 'The eclipse of the good physician: A trifocal perspective on medicine as a moral enterprise, presented to St Augustine College of South Africa.