Patent ID: 8186829

Claim:
A progressive ophthalmic lens comprising a complex surface, a prism reference point (O) and a fitting cross (FC), and suitable for being placed in front of a wearer's eye so that a scan along the wearer's line of sight through the lens defines a meridian line (ML) corresponding to a trace of the intersection of said line of sight with said surface, said meridian line connecting an upper edge of the lens to a lower edge, passing through a far-vision reference point (FV), the fitting cross, the prism reference point and a near-vision reference point (NV), the fitting cross (FC) being located at 4 mm above the prism reference point (O) and the near-vision reference point (NV) being located at 14 mm below said prism reference point (O), and the complex surface having a power addition between the far-vision reference point (FV) and the near-vision reference point (NV) and having: (i) a cylinder value normalized to the addition of less than 1.0 over the entire complex surface of the lens; (ii) a mean sphere normalized to the addition, having no rebound on a circle of radius 20 mm centered on the prism reference point (O); and (iii) a progression length of less than or equal to 15 mm, said progression length being the distance measured vertically between the fitting cross (FC) and a point on the meridian line for which the mean sphere has a difference of 85% of the addition relative to the far-vision reference point, the lens being further characterized in that: (iv) the mean sphere of the complex surface has a variation normalized to the addition, in any segment of the meridian line (ML) between the prism reference point (O) and the far-vision reference point (FV), of less than or equal to 0.08.