Patent ID: 8210677

Claim:
A patch intended to be fixed to a curved surface of an optical component to modify an optical power of said component, the patch comprising a refractive Fresnel lens formed by a series of Fresnel zones arranged one inside the other parallel to a smooth face of said patch and presenting jumps in height between two successive zones greater than five times an average wavelength of visible light, said jumps in height being measured in a direction perpendicular to the smooth face at an optical center of the patch, the patch being characterized in that, prior to being fixed on the curved surface, it has a generally bulging and substantially spherical shape with a mean radius of curvature between 135 mm and 53 mm, in addition to the jumps in height between successive Fresnel zones, and in that the jumps in height between successive Fresnel zones are situated on a generally convex face of the patch.