Abstract: Method for providing an optical system (OS) of an ophthalmic spectacle lens according to wearer's prescription data and wearer's optical needs with the provision that a wearer's optical need is not related to prescription data, where said optical system (OS) is defined by at least a front and a back surfaces (S1, S2) and their relative position, comprising the steps of: a) providing a semi-finished lens blank (SB); b) providing contour data (CD); c) choosing at least one localized optical feature (LOFi) suitable for the wearer's needs; d) positioning the contour data (CD) wherein the semi-finished lens blank (SB) comprises: a first surface (SB1) having in each point a mean sphere value (SPHmean) and a cylinder value (CYL), a second unfinished surface, the first surface (SB1) comprising: a plurality of primary areas (Ai); border areas (Bi); and a secondary area.

Abstract: Method for providing an optical system (OS) of an ophthalmic spectacle lens according to wearer's prescription data and wearer's optical needs with the provision that a wearer's optical need is not related to prescription data, where said optical system (OS) is defined by at least a front and a back surfaces (S1, S2) and their relative position, comprising the steps of: providing a semi-finished lens blank (SB); (a) providing contour data (CD); choosing at least one localized optical feature (LOFi) suitable for the wearer's needs; positioning the contour data (CD) wherein the semi-finished lens blank comprises: a first surface (SB1) having in each point a mean sphere value (SPHmean) and a cylinder value (CYL), a second unfinished surface, the first surface (SB1) comprising: a main area; t least a peripheral area (Ai).