Single Vision corrects nearsightedness, farsightedness (readers) and astigmatism. It contains the same amount of vision correction throughout the entire lens.
Progressive lenses are true "multifocal" lenses that provide a seamless progression for all viewing distances.
Bi-focal vision wearer also check out with - Progressive Vision option. Default bi-focal option is no line bi-focal. Lined bi-focal upon request, please leave a note at check-out.