What did the first bifocals look like?

The first bifocals, attributed to Benjamin Franklin in the late 18th century, featured a single lens with two distinct optical zones: the upper part for distance vision and the lower part for reading. These lenses were typically made from glass and had a visible dividing line between the two sections. They were often set in frames that resembled those of regular glasses, but the distinct dual functionality set them apart as a practical solution for individuals needing correction for both near and far sight.