Patent ID: 7207674

Claim:
An ophthalmic lens having a complex surface with an optical centre (0, 0), a fitting cross (FC) situated 4 mm above the optical centre on the vertical axis of the lens, a markedly umbilicated meridian having a power addition (A) between a reference point in far vision (FV) and a reference point in near vision (NV), the complex surface having: a mean-sphere difference normalized to the addition on the meridian, between the geometric centre of the lens (0, 0) and the control point in far vision (FV), less than or equal to 0.1; a progression length less than or equal to 14 mm, the progression length being defined as the vertical distance between the fitting cross (FC) and the point on the meridian at which the mean sphere reaches 85% of the progression of the addition; a rebound in the sphere quantity normalized to the addition (sphere/addition) on a circle with a radius of 20 mm centered on the geometric centre of the lens of less than 0.11; a maximum slope of the variation of the sphere normalized to the addition along the meridian comprised between 0.09 and 0.11 mm −1 .