trifocal


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tri·fo·cal

(trī'fō-kăl),
Having three foci. See: 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 ?
Ophthalmology practice company Vision For Life in Nashville stated on Friday that it plans to surgically implant the new US FDA approved PanOptix Trifocal Intraocular Lens on 4 September 2019 at 11:00 at The Eye Surgery Center of Middle Tennessee.
Patients with multifocal vision are exquisitely sensitive to even low amounts of astigmatism and any surgeons using multifocal or trifocal IOL technology must be willing and able to address this either pre- or post-operatively.
Osama added:"We implanted trifocal multifocal implants in both eyes, with very good and fast results; he was able to see well the day after surgery and his distance vision is now better than 20/20 in both eyes, with no complications -- he can read and use a computer without glasses.
Based on the foregoing, establishing a national system of qualification standards involving the trifocal educational institutions and the numerous formal and non-formal training service providers is clearly a complicated task.
PanOptix, the implant is a trifocal lens offering a full range of vision - near, intermediate and distant vision," he explained.
If you wear bi- or trifocal glasses, exercise with your eyewear on to ensure that you don't fall while exercising.
Several surgical techniques have been developed for the correction of pseudophakic presbyopia, including monovision, (21,22) multifocal IOLs, (6) accomodative IOLs, (23) toric multifocal IOLs, (24) and trifocal IOLs.
This result is similar to that of another study examining postoperative results of a trifocal toric lens [28].
They employed trifocal tensor geometry information and a multistate constraint Kalman filter in the algorithm architecture to reduce the time consumption and enhance the accuracy of the algorithm.
Refractive index of the material - 1.55, Packed with viscosubstance - 2% hydroxypropyl methylcellulose with a viscosity of 20,000 to 40,000 mpa.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?
Thus, the RPO develops quality management mechanisms to ensure nourishing contribution to the trifocal functions of the University through the utilization of research outputs in instruction, community involvement, and policy formulation.