| 摘要 |
The invention relates to a refractive device, comprising a substrate made from glass or a crystalline material, with at least one optically functional boundary surface, embodied as a Fresnel lens, with a medial zone and at least two further adjacent zones (11, 12, 13), whereby the extent of the medial and/or the extent of one of the at least two further zones (11, 12, 13) is less than 1 mm in the direction in which the zones (11, 12, 13) are connected and the Fresnel lens is a cylindrical Fresnel lens such that the at least one optically functional boundary surface is at least partly, in particular, over the entire width of the boundary surface, uniformly embodied in a direction perpendicular to the direction of connection of the zones (11, 12, 13). |
