<P> In 1955 , Irving Rips of Younger Optics created the first seamless or `` invisible '' bifocal , a precursor to all progressive lenses . </P>
<P> In 1955 , Irving Rips of Younger Optics created the first seamless or `` invisible '' bifocal , a precursor to all progressive lenses . </P>
who created the first seamless bifocal a precursor to all progressive lenses
who created the first seamless bifocal a precursor to all progressive lenses
Irving Rips
Irving Rips