Abstract: In an optical filter for sunglasses, having a transmittance of less than 20% for light wavelengths from 400 nm to 650 nm, the transmission spectrum comprises a local transmission maximum in each of the light wavelength ranges between 440 nm and 470 nm and also between 570 nm and 590 nm and a local transmission maximum in the light wavelength range between 600 nm and 620 nm, wherein the transmittance below the connecting line of the local transmission maximum between 440 nm and 470 nm and the local transmission maximum between 570 nm and 590 nm has an essentially convex overall curve with a breadth of variation less than 8%.

Abstract: A method and a device are described for determining the optical center point of the lenses of spectacles to be manufactured for a spectacle wearer, whose head is imaged from the front using a digital camera (10), wherein the location of the pupils (16) and the interpupillary distance (20, 21) are determined with the aid of an image evaluation program to define the optical center point of the lenses.

Abstract: In an optical filter for sunglasses, having a transmittance of less than 20% for light wavelengths from 400 nm to 650 nm, the transmission spectrum (1, 2, 3) comprises a local transmission maximum (5, 6, 7) or (9, 10, 11), respectively, in each of the light wavelength ranges between 440 nm and 470 nm (4) and also between 570 nm and 590 nm (8) and a local transmission maximum (13, 14) in the light wavelength range between 600 nm and 620 nm (12), wherein the transmittance below the connecting line of the local transmission maximum (5, 6, 7) between 440 nm and 470 nm and the local transmission maximum (9, 10, 11) between 570 nm and 590 nm has an essentially convex overall curve (16) with a breadth of variation less than 8%.