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A Franklin bifocal, also known as an executive bifocal, is an eyeglass lens made by joining two half lenses along a horizontal line. The upper section provides distance correction, and the lower section supports near vision tasks. This design was first created by Benjamin Franklin, who wanted a single pair of glasses for reading and distance vision.
read more about Franklin bifocal ...Each section of the lens is crafted with a specific prescription.
The two halves are joined with a visible line across the middle. This structure allows users to shift their gaze between viewing zones without switching glasses.
Franklin bifocals provide clear separation between visual zones and are easy to adapt to. However, the distinct line can be noticeable and may cause image jumps when switching focus. They are less common today but still used in specialized or occupational eyewear.
Modern bifocals have the near segment fused into the lower portion of the lens, creating a smoother transition. Franklin bifocals retain a full-width reading area, making them ideal for tasks that require large fields of near vision such as drafting or desk work.
They are often prescribed for professions that require clear and wide near vision.
Benjamin Franklin designed the first bifocal lenses in the 18th century.
Yes, they are occasionally custom-made for specialized uses.
Yes, the upper and lower lenses meet along a straight, visible horizontal seam.
If you require an extremely wide field of view for both distance and near tasks that modern progressives cannot provide, ask your doctor about an Executive or Franklin-style bifocal. These are often used by pilots or architects who need a full-width reading segment.
College of Optometrists. History of Spectacles (college-optometrists.org). 2024.
American Academy of Ophthalmology. Evolution of Bifocals (aao.org). 2024.
Museum of Vision. Benjamin Franklin's Lenses (museumofvision.org). 2023.
Optical Journal. The Design of Franklin Lenses (opticaljournal.com). 2024.