How many kinds of bifocal lens do you know?

[children glasses]

We all know that today, bifocal eyeglasses are a necessary company for many of us who both suffered from near and distance vision, so, are you planning to buy a pair of bifocal eyeglasses? How many kinds of them do you know? Here are 4 types of typical bifocals, one line bifocal glasses, Flat-topped bifocal glasses, vaulted bifocal glasses, contact bifocal glasses!