What is the heaviest type of bifocal lens?

The heaviest type of bifocal lens is the executive lens, which is designed with a wide, horizontal segment that spans the entire bottom portion of the lens. Unlike other bifocal designs that may have a smaller segment or a more rounded configuration, the executive lens has a larger area for near vision use, which adds to its overall weight. The shape and size of the executive lens allow for a larger and more functional reading area, but this also means that the material used in its construction contributes significantly to its weight compared to other bifocal options.

In contrast, the trifocal lens typically includes three sections for varying distances, while flat-top and round segment lenses feature smaller bifocal segments. These other variations are generally lighter because they do not feature the same breadth of material as the executive lens does.