Progressive multifocal ophthalmic lens

A multifocal ophthalmic lens comprising an aspherical surface having a first vision zone for far vision, a second vision zone for near vision, and between said first and second zones, a third vision zone for intermediate vision with the curvature thereof varying progressively along a main meridian curve of power progression that extends from the top edge to the bottom edge of the lens and that passes successively through all three vision zones of the aspherical surface, passing through three predetermined points thereof, namely a first point situated in the first vision zone and called the far vision power measurement point where the aspherical surface has a first predetermined mean sphere value, a second point called the mounting center and situated between the first point and the geometrical center of the aspherical surface, and a third point situated in the second vision zone and called the near vision power measurement point where the aspherical surface has a second predetermined mean sphere value, the difference between the first and second mean sphere values being equal to the power addition A of the lens, the main meridian curve having a shape that depends on the value of the power addition and that in a front view of the aspherical surface includes a first portion extending vertically from the top edge of the lens to the second point, and a second portion extending obliquely from the second point towards the nose side of the lens, wherein the second portion of the main meridian curve includes a first segment which extends from the mounting center to a fourth point situated above the third point generally in a first direction at a first angle .alpha. of predetermined value relative to the vertical first portion of the main meridian curve, which predetermined value depends on the power addition A in accordance with an increasing function .alpha.=f(A), and a second segment which extends from the fourth point to the third point generally in a second direction at a second angle .omega. relative to the vertical first portion of the main meridian curve, the second angle .omega. having a predetermined value such that 0<.omega.<.alpha., and wherein the aspherical surface has a predetermined mean sphere value S.sub.C at the fourth point which is equal to:

• S.sub.C =S.sub.L +k.A
• where S.sub.L is said first predetermined mean sphere value at the first point, A is the power addition, and k is a coefficient such that:
• 0.8<k<0.92.