bifocal

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bifocal

1. Optics having two different focuses
2. relating to a compound lens permitting near and distant vision
References in periodicals archive ?
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.
Getting one's head positioned so as to see through the bifocals can be a real problem.
Bret custom grinds a lined bifocal directly into the upper part of the lens.
The remaining problem here, aside from the physical contortions necessary to use the bifocals, is that in a confrontation you may well not be wearing your full-fame corrective glasses with bifocals.
Agent Welch's problem, we know now, is that like most bifocals, his were "upside down" for shooting.
While improving the poor eyesight of many since then, Franklin's bifocals also provide a lesson in the kind of vision that businesses must possess to be successful.
Rosenthal recommends purchasing a pair of glasses for reading and computer work, or else, bifocals, which have areas for near and distance vision.
While the results of a subgroup of studies showed that there was no significant gender-related difference in the eye's ability to focus clearly on objects at near distances, the overall analysis provided evidence that women have a need for higher power reading glasses or bifocals than men of an equivalent age.
Until now, clinicians requiring larger prescriptions or bifocals in the carrier lens were limited in the styles of frames available.
Nobody is immune from this condition, and unchecked it inevitably means reading glasses, bifocals or varifocals.