A progressive multifocal ophthalmic lens has a complex surface having a prism reference point, a fitting cross, a progression meridian having a power addition greater than or equal to 1.5 diopters. The lens has, under conditions when being worn: a reduced root mean square, normalized...http://www.google.com.au/patents/USRE42781?utm_source=gb-gplus-sharePatent USRE42781 - Ophthalmic lens
