Today’s bifocals offer an even greater solution, with just a small segment of the lens devoted to near vision correction and the remainder of the lens is used to correct the additional problem. The portion that is used for near vision correction can be a round, half-moon, or rectangular shape.
Typical bifocals have concrete lines that separate the different lenses. Progressive lenses offer the same features, but without the lines. This type of lens is useful for all corrections but does not utilize any separation of segments between the different prescriptions.