Bifocal
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.
bestial bipedal bifocal
My gran has some bifocal glasses.
science bifocal
Bicycle, Bilingual, Binoculars, Bifocal, Biped
Benjamin Franklin
Benjamin Franklin in America is usually regarded as the inventor of the Bifocal glasses .
Bifocal contacts lenses are a better option..:)
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.
Bifocal
Bifocal lenses as a concept were not patented; there are dozens of patents related to bifocals, bifocal contacts, and processes to make bifocals.