Spectacle lens provided with a permanent marking

A spectacle lens provided with a permanent marking, said lens comprising:

• a substrate;
• and
• an anti-reflective interferential or mirror interferential coating covering said substrate on the side of a front face of the spectacle lens, said anti-reflective interferential or mirror interferential coating forming a two-dimensional barcode pattern, said marking being formed by a plurality of punctual gaps on a part of a thickness of said anti-reflective interferential or mirror interferential coating, said front face exhibiting outside of said punctual gaps a coefficient of reflection of light having a predetermined nominal value and in each said punctual gap a coefficient of reflection of light having a predetermined particular value different from said nominal value,
• wherein the two-dimensional barcode pattern is one of a Quick Response (QR) code, a DataMatrix code, an Aztek code, a MaxiCode, and a High Capacity Color Barcode, and
• wherein said two-dimensional barcode pattern comprises a plurality of modules juxtaposed in matrix fashion, said plurality of modules comprising, in order to encode an item of information as claimed in a binary language, modules of a first type and modules of a second type, each of the modules of the first type being formed by a plurality of the punctual gaps, each of the modules of the second type being situated outside of said punctual gap.