An improved opthalmic lens is disclosed which has a plurality of alternating power zones with a continuously varying power within each zone, as well as in transition from one zone to another. In other words, a plurality of concentric zones (at least two) are provided in which the variation from far to...http://www.google.com/patents/US5521656?utm_source=gb-gplus-sharePatent US5521656 - Method of making an ophthalmic lens
