Patent ID: 7736742

Claim:
An optical article comprising a transparent substrate made of organic or mineral glass, having main front and rear faces, at least one of said main faces comprising a multi-layer anti-reflection coating, wherein said anti-reflection coating comprises at least two visible-absorbing layers comprising a sub-stoichiometric titanium oxide, the visible-absorbing layers being such that the relative transmission factor of visible light Tv is reduced by at least 10% compared with the same article not comprising said visible-absorbing layers, and wherein the anti-reflection coating formed on at least one of the faces of the substrate comprises a stack of alternating high refractive index (HI) and low refractive index (LI) layers, wherein: at least one of the visible-absorbing layers is a high index (HI) layer comprising a sub-stoichiometric titanium oxide, and at least one of the low index (LI) layers comprises a mixture of silicon oxide and aluminum oxide.