Patent ID: 8007102

Claim:
A method for determining an ophthalmic lens comprising: choosing a lens with a first face and a second face; defining an initial surface for the second face of the lens with a central zone of diameter D ini , and a peripheral zone of inner diameter D rac greater than the diameter D ini , of the central zone, one or more points in the central zone and one or more points in the peripheral zone situated on the inner diameter D rac having an altitude defined with respect to an axis (Z) normal to the second face of the lens and having the centre of the central zone as its origin, the altitude of the peripheral zone being defined as the altitude of a lowest point situated on the inner diameter D rac ; the peripheral zone having a maximum radius of curvature comprised between the maximum radius of curvature of the first face and the maximum radius of curvature of the central zone; choosing an interpolation formula; optimizing the lens by applying: target values for power and astigmatism for a given direction of glance in the central zone of the second face of the lens; the interpolation formula to the central and peripheral zones to define an interpolated surface comprising a connecting zone, the interpolated surface minimizing a merit function for different relative altitudes of the peripheral zone with respect to the central zone.