My gran has some bifocal glasses.
I used my bifocals to watch the television
Bifocal
a bifocal lens
No-line bifocal is a generic name for a progressive. Opticians use the "no-line" bifocal term because sometimes patients are hear "progressive" and think "transitions" which are lenses that turn to sunglasses when exposed to UV light.
science bifocal
Benjamin Franklin
Bifocal contacts lenses are a better option..:)
Benjamin Franklin in America is usually regarded as the inventor of the Bifocal glasses .
Bifocal is a type of corrective lens. Bifocal lenses are divided into two sections, usually the top for seeing far away objects and the bottom for seeing nearby objects.
It means you are using a bifocal contact lens that has a bifocal power of about +1.25 to +1.50. A high add would have the bifocal power of about +2.50.
Bifocal
a bifocal (using both eyes) disecting microscope. probably with zoom lens