A bifocal multiorder diffractive lens having a lens body with one or more first regions having a first multiorder diffractive structure providing near vision correction, and one or more second regions having a second multiorder diffractive structure providing distance vision correction, in which the...http://www.google.se/patents/US7093938?utm_source=gb-gplus-sharePatent US7093938 - Bifocal multiorder diffractive lenses for vision correction
