The standard bifocal (with lines) provides best vision at distance (driving) and at near (reading), with minimal distortion off to the side. ... The progressive (no line) bifocal changes gradually from top to bottom, including a range of powers which provides clear vision at all distances, from far to near.

Do bifocal lenses have a line?

Bifocal lenses are lenses with lines separating two different prescriptions. There is a distance prescription on top and a reading distance on the bottom, which is good for viewing objects up close. ... Round: The lower part of the bifocal lens is rounded, giving you a less distinct separating line.

Are there bifocals without lines?

Progressives, or “no-line bifocals,” have a gradual curvature across the lens surface and provide not only clearer vision at near and far distances, but also smooth, comfortable transitions in between. Today you can find factory molded progressive lenses at many major retailers and even on the Internet.