Spectacle lens providing ophthalmic vision and an additional vision

A method for producing a spectacle lens configured to provide a wearer of the lens with an ophthalmic vision and an additional vision, said lens including:

• a front face, a rear face, a refringent medium, and an insert, said rear face being configured to face an eye of a wearer for a position of use of said lens;
• the refringent medium being situated between the front and rear faces;
• the insert being situated within the refringent medium and configured to deliver, between the front and rear faces of the lens, through an output window of said insert toward the eye of the wearer, light forming an additional image visible to the wearer in the position of use of the lens;
• the ophthalmic vision corresponding to an image formed by light having passed in succession through the front face, a front portion of the refringent medium situated on a front side of the insert, the insert or an intermediate portion of the refringent medium situated outside a peripheral edge of said insert, a rear portion of the refringent medium situated on a rear side of the insert, and the rear face of the lens;
• and the additional vision corresponding to the additional image formed by said light passing through the insert, the rear portion of the refringent medium and the rear face of the lens;
• the method comprising:
• obtaining an ophthalmic prescription for the wearer of the lens;
• determining an additional prescription for said additional vision from the ophthalmic prescription and from a position of the additional image;
• determining a curvature value for the rear face of the lens corresponding to the additional prescription, at an additional prescription point;
• determining a curvature value for the front face of the lens at an ophthalmic prescription point, according to the ophthalmic prescription and the curvature value of the rear face of the lens;
• calculating additional curvature values for the rear face of the lens outside the additional prescription point, at least inside an area of said rear face corresponding to the output window of the insert, designed so that said rear face area produces a correction for the additional vision which corresponds to the additional prescription;
• calculating additional curvature values for the front face of the lens outside of the ophthalmic prescription point, designed so that said lens produces a correction for the ophthalmic vision which corresponds to the ophthalmic prescription, when the rear face of the lens has the additional curvature values calculated for the rear face;
• and
• producing the spectacle lens with the additional curvature values calculated for the front and rear faces.