What is Bifocals?
[[File:Bifocals by Benjamin Franklin - Franklin Institue - DSC06605.JPG|thumb|Bifocals made by [[Benjamin Franklin]]]] '''Bifocals''' are [[eyeglasses]] with [[Lens (optics)|lenses]] that are split between two different strengths. Usually the lower half of each lens is made to help the wearer read, while the upper one is to help the wearer see at a distance. {{Glasses}} {{tech-stub}} [[Category:Eyeglasses]]