How Many Types Of Bifocal Lenses Are There?
How Many Types Of Bifocal Lenses Are There? Flat-top bifocal lens (also called a D-seg or straight-top). Round segmented bifocal lens. Executive bifocal lens (also called the Franklin bifocal). Bifocals contain two lens powers; trifocals have three. How many types of bifocal lens are available? Flat-top bifocal lens (also called a D-seg or straight-top). Round