Progressive Lenses give multiple focal corrections in one lens without the added thickness of a usual bifocal lens. This option is only necessary for those who need both distance and reading corrections,but do not want a pair of glasses for each! With this lens type there are two prescriptions needed; one on the top of the lens for seeing at a distance, and one at the bottom for close upreading. This lens is an invisible bifocal, and seamlessly transitions between the prescriptions.
