Concentric ring single vision lens designs

Claim 1

A concentric annular ring, single vision lens which focuses light rays passing through annular portions of the periphery of the lens at the same focal plane as light rays passing through the center of the lens, thereby increasing the quality of the lens image and improving its depth-of-focus, comprising: a. a single vision lens, said lens having a front surface and an opposite back surface, wherein one of the front and back surfaces defines a central area comprising a circular disc having a surface corresponding to a basic prescriptive spherical refractive power which focuses light rays passing through said central area at a particular focal plane; and b. a plurality of annular rings surrounding the central area, some of which comprise sphere power annular rings which have a surface corresponding to the basic prescriptive spherical refractive power and some of which comprise sphere' power annular rings which have a surface corresponding to a less plus or greater minus refractive power relative to said basic prescriptive spherical refractive power, whereby light rays passing through said sphere' power annular rings are focused at the same focal plane as light rays passing through said central area to mediate spherical aberration and improve visual acuity, and whereby light rays passing through said sphere power annular rings will focus in front of light rays passing through said central area.