Semi-finished lens to be machined for forming an ophthalmic lens to be mounted in a spectacle frame, set and a method involving the same

Method for manufacturing an ophthalmic lens (11;

• 111) having a first optical face (19), a second optical face (20) and a final outline (32) for the ophthalmic lens (11;
• 111) to be mounted in a spectacle frame (10), the method comprising:
• providing:
• a semi-finished lens (22) comprising (a) a blank (23) formed in a first material having a first hardness, the blank (23) having an outline (33), a first face (26) and a second face (27), the second face (27) being configured to be surfaced so as to constitute a first optical face (19) of the ophthalmic lens (11;
• 111), and (b) a top layer (24) formed in a second material having a second hardness, the second hardness being greater than the first hardness, the top layer (24) having an outline (34), a first face (29) and a second face (30), the second face (30) of the top layer (24) being arranged on the first face (26) of the blank (23), the outline (34) of the top layer (24) being equal to or included in the outline (33) of the blank (23), and the outline (34) of the top layer (24) satisfying to a predetermined dimensional selection criterion involving the final outline (32) of the ophthalmic lens (11;
• 111);
• and
• a data support (35) containing data representative of said final outline (32) of said ophthalmic lens (11;
• 111) to be mounted in said spectacle frame (10);
• and
• surfacing the second face (27) of the blank (23) of the semi-finished lens (22) so as to form the first optical face (19) of the ophthalmic lens (11;
• 111).