Patent ID: 8061838

Claim:
Progressive lens for ophthalmic spectacles comprising at least one complex surface having a variable curvature, a prism reference point (O) and a fitting cross (CM), and adapted in order to be placed in front of a wearer's eye so that a scan of a direction of view of the wearer through the lens defines a meridian line (LM) corresponding to a intersection path of said direction of view with said surface, said meridian line linking an upper edge and a lower edge of the lens, passing successively through a far-vision point (VL), the fitting cross, the prism reference point and a near-vision point (VP), the fitting cross (CM) being situated at 4 mm above the prism reference point (O) and capable of corresponding to a horizontal direction of view when the wearer is standing, an optical power of said lens along the meridian line (LM) corresponding to a far-vision ophthalmic correction in a first segment (S 1 ) of said meridian line situated above the far-vision point (VL), increasing until reaching a maximum value at the near-vision point (VP) and decreasing starting from said near-vision point over a determined length in the direction of the lower edge, so that the lens has an optical power addition between far-vision (VL) and near-vision (VP) points, and has moreover an additional zone for intermediate vision close to the lower edge, the optical power addition being greater than or equal to 2.0 diopters, the lens being characterized in that, there is an optical-power increase threshold along the meridian line (LM) which is situated approximately at the level of the fitting cross (CM), at a distance from the prism reference point (O), with a first optical power variation between the far-vision point and said fitting cross which is less than 10% of the optical power addition, in absolute value, and a second optical power variation between the far-vision point and said prism reference point which is greater than 25%, in absolute value.