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 ?
There are a few specialist multifocal lenses that can aid with anisometropic cases, but it is also worth considering the option of different round segment bifocals. Dispensing unequal round segments not only helps to balance out the differential prismatic effect at the NVP, but also presents an inexpensive alternative to specialist bifocals.
I personally had bifocal cataract implants placed into my eyes (Crystalens HD).
Their insight that the SC 'bifocals' directly translate into faster and more accurate eye movements towards the upper visual field could help in strategic placement of essential feedback requiring rapid orienting.
To bring the reticle into sharp focus, the bifocal wearer has to view it through the lower portion of the eyeglasses, and that means raising or tilting one's head.
This is basically an inverted bifocal. While Bret did not invent this concept, his execution is flawless and a boon to aging shooters.
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.
Generally recognized as an invention of Benjamin Franklin's in the 1700s, bifocals are eyeglasses with two distinct optical powers that give wearers the ability to clearly see objects both near and far.
I can't remember Just a line to say I'm living That I'm not among the dead Though I'm getting more forgetful And mixed up in my head I've got used to my arthritis To my dentures I've resigned I can manage my bifocals But god I miss my mind!
Bifocals will cost PS59.95, and varifocals PS79.95.
In my case, now needing bifocals, my shooting glasses have the bifocal at the top of the right lens.