| 摘要 |
This invention relates to an ophthalmic lens with an antireflective coating with a low reflection both in the ultraviolet region and in the visible region. The lens comprises a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating (3 or more layers, preferably 4 or more). The multilayered coating comprises a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 with a wavelength 55 nm; the mean reflection factor on the rear face in the visible region Ris lower than or equal to 1.15%; the mean light reflection factor on said rear face in the visible region Ris lower than or equal to 1%; the mean reflection factor Ron said rear face in the range between 280 and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°; the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide; the antireflective coating outer layer is a silica-based layer, and the mean spectral reflection factor on said rear face for at least one wavelength in the 280-295 nm range for both an angle of incidence of 30° and an angle of incidence of 45° is higher than 5%. The lens according to the invention does especially prevent the reflection of the UV radiation produced by light sources located behind the wearer. |
