An optical safety component intended to be observed in reflection, with the naked eye, according to at least a first observation face, comprising: - a first layer of dielectric material, at least partially transparent in the visible, with a first refractive index (n 1), - a second reflective layer forming a reflective interface with said first layer in at least a first region, in which: - said reflective interface comprises at least a first optical structure with first elementary surfaces (I 1) and second elementary surfaces (I 2), the contours of said first and second elementary surfaces being complementary in plan view, - the first elementary surfaces (I 1) are nanostructured so as to form at least a first nanostructure, said first nanostructure being scattering or forming a first one- or two-dimensional grating; - the second elementary surfaces (I 2) are not nanostructured or are nanostructured in such a way as to form at least a second nanostructure, different from said first nanostructure, said second nanostructure being scattering or forming a second one- or two-dimensional grating; - the first elementary surfaces (I 1) and the second elementary surfaces (I 2) follow the profile of a one-dimensional matrix (ML 1) of mutually identical cylindrical microlenses (L 1), arranged periodically in a first direction (ΔL), with a first period (p 1); - said first elementary surfaces (I 1) or said second elementary surfaces (I 2) have contours forming, in plan view, recognizable and identical micro-images, arranged periodically along a second direction and with a second period, the optical component exhibiting in reflection and under the effect of a tilt movement about an axis perpendicular to said first direction, a magnification and a displacement of said first micro-images by Moire magnification. - a first layer of dielectric material, at least partially transparent in the visible, with a first refractive index (n 1), - a second reflective layer forming a reflective interface with said first layer in at least a first region, - said reflective interface comprises at least a first optical structure with first elementary surfaces (I 1) and second elementary surfaces (I 2), the contours of said first and second elementary surfaces being complementary in plan view, - the first elementary surfaces (I 1) are nanostructured so as to form at least a first nanostructure, said first nanostructure being scattering or forming a first one- or two-dimensional grating; - the second elementary surfaces (I 2) are not nanostructured or are nanostructured in such a way as to form at least a second nanostructure, different from said first nanostructure, said second nanostructure being scattering or forming a second one- or two-dimensional grating; - the first elementary surfaces (I 1) and the second elementary surfaces (I 2) follow the profile of a one-dimensional matrix (ML 1) of mutually identical cylindrical microlenses (L 1), arranged periodically in a first direction (ΔL), with a first period (p 1); - said first elementary surfaces (I 1) or said second elementary surfaces (I 2) have contours forming, in plan view, recognizable and identical micro-images, arranged periodically along a second direction and with a second period, the optical component exhibiting in reflection and under the effect of a tilt movement about an axis perpendicular to said first direction, a magnification and a displacement of said first micro-images by Moire magnification.