Definitions for "Progressive Lens"
A no-line lens with a gradual blend of prescriptions ranging from the prescription for distance viewing at the top to the reading prescription at the bottom. Worn in lieu of bifocals and trifocals, which have visible lines.
a special kind of no-line multifocal that incorporates all corrections, from distance to close-up, into one lens without any separation of the various visual zones by line
a trifocal lens without visible lines separating the three visual areas