Bobster introduces clear to smoke transitional, polycarbonate multifocal lenses whose corrective powers change progressively throughout the lens. Perfect lenses for any kind of lighting, indoor or outdoor. A wearer looks through one portion of the lens for distance vision, another for intermediate vision, and a third portion for reading or close work. Each area is blended invisibly into the next, without the lines that traditional bifocals or trifocals have. Please visit bobster.Com for information.