LENS WITH SURFACE MICROSTRUCTURES ENCAPSULATED BY A SELF-STRATIFIED HARD COAT

The invention relates to an optical article comprising a base lens substrate having at least one optical element or a plurality of optical elements such as microlenses, said article exhibiting good optical properties and good mechanical properties. More precisely, it relates to an optical article comprising: - a base lens substrate having opposing first and second lens surfaces; - a protective layer having opposing first and second protective surfaces, the first protective surface disposed on the second lens surface; and - at least one or a plurality of optical elements, each: defining a portion of one of the first protective surface and the second lens surface; having a maximum height, measured in a direction perpendicular to the second lens surface carrying them, that is less than or equal to 0.1 millimeters (mm) and a diameter that is less than or equal to 2.0 mm. wherein the protective layer is composed of: a self-stratified coating having at least two distinct layers: - a first layer LSSC1 corresponding to the innermost part of the protective layer and having two opposing surfaces, one surface corresponding to first protective surface - and a second layer LSSC2 corresponding to the outermost part of the protective layer and having two opposing surfaces, one surface corresponding to second protective surface the self-stratified coating resulting from the polymerization of a self-stratifying composition comprising at least two, preferably two incompatible resins compositions, resin composition 1 and resin composition 2 the first layer LSSC1 being constituted of one of the at least two resins resin compositions, resin composition 1 after curing, cured resin 1, said cured resin 1: - showing a refractive index nSSC1 being lower than the refractive index nm of the at least one or each optical element such that the difference nm nSSC1 is greater than 0.045, preferably greater than 0.10, or even greater than 0.15; the second layer LSSC2 being constituted of the other one of the at least two resin compositions, resin composition 2 after curing, said cured resin 2: - showing a refractive index nSSC2 being similar or higher than the refractive index nSSC1. The invention also relates to the method for forming such optical articles. L'invention concerne un article optique comprenant un substrat de lentille de base ayant au moins un élément optique ou une pluralité d'éléments optiques tels que des microlentilles, ledit article présentant de bonnes propriétés optiqu