Abstract: The invention relates to an optical article comprising at least: (a) a substrate having a front main face and with a rear main face: (b) at least one photochromic compound that is able to undergo a transformation from one state, defined as “deactivated state” to another state, defined as “activated state” in response to predetermined wavelengths of the electromagnetic spectrum, (c) coated directly or indirectly onto the front face of said substrate (a), a mirror coating, said mirror coating—comprising at least two layers having a low refractive index which is lower than 1.55, defined as “LI layer”, and at least two layers having a high refractive index which is equal to or higher than 1.55, defined as “HI layer”,—and having a mean light reflection factor for wavelengths ranging into said predetermined wavelengths of the electromagnetic spectrum, defined as Rm(predetermined spectrum) that is lower than or equal to 1.

Abstract: Disclosed is an optical article including a substrate having at least one main face coated with a reflective coating including a stack of at least one high refractive index layer having a refractive index higher than 1.55 and at least one low refractive index layer having a refractive index of 1.55 or less, in which the thicknesses of the layers in the reflective coating have been optimized according to specific design rules in order to boost the abrasion resistance of the optical article.

Abstract: Disclosed is an optical article including a substrate having at least one main face coated with a reflective coating including a stack of at least one high refractive index layer having a refractive index higher than 1.55 and at least one low refractive index layer having a refractive index of 1.55 or less, in which the thicknesses of the layers in the reflective coating have been optimized according to specific design rules in order to boost the abrasion resistance of the optical article.