Progressive lenses are a wonderful innovation in eyewear. But they’re not for everybody.
Progressive lenses are not bifocals (or trifocals)
Progressives give you line-free multifocal glasses.
The goal is to get a seamless progression from your lenses that deliver magnifying power for near and intermediate vision. Each lens changes gradually from point to point on the surface to provide the correct lens power for seeing clearly at various distances.
They differ from bifocals, which have only two lens powers—one for distant objects and one in the lower half of the lens—for vision correction at a specified reading distance. With bifocals, the different power zones have a clearly visible line across the center of the lens.
Progressive lenses don’t have this line. In fact, they’re sometimes called “no-line bifocals.” The truth is, progressive lenses offer a more advanced multifocal design than bifocals—or trifocals.