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 ?
Bifocal spectacles are made so that the wearer looks through one part of the glass into the distance and another part of the glass for close-up work.
And my glasses don't have the conspicuous bifocal line or the annoying `jumps' in vision.
Concentric RGP bifocals are especially suitable when good near vision is required above eye level, although some patients find the superimposed images difficult to ignore.
For example, insurers and their commercial policyholders need to apply bifocal vision to cyber risk.
Varying degrees of success have been reported for both bifocal and progressive addition lenses; in some cases success has been limited to subjects with large near esophoria, (20) large accommodative lags, (21-22) or rapid myopia progression rates.
Using bifocals requires coordination, never my strongest suit.
More specifically, the children accommodate much more accurately through their bifocals than do the control children through their ordinary lenses.
If you need bifocals to read, you still need them in your shooting glasses so you can read headstamps of cartridge cases and caliber markings on firearms.
Or, they get bifocals, which have divided lenses-a top part for seeing far and a bottom part for seeing near.
The good news is that we're far from the days when the only solution was a pair of bifocals or dime-store reading glasses.
In his life, Franklin founded the first major civilian hospital and medical school in the American colonies, studied the effectiveness of smallpox inoculation, invented bifocals and the "long-arm" to make life easier for the aged and afflicted, and became a proponent of improved preventive care, bedside medicine, and personal hygiene.