Contrast enhancing filter for eye glasses and contrast enhancing eye glass

摘要

An optical filter for eye glasses, in particular suitable for spectacle lenses or ski goggles, has a spectral power transmission curve of optical radiations. The spectral power transmission curve exhibits a local maximum spectral transmission (T_max) of radiations in a first wavelength range (Δλ_max). The first wavelength range (Δλ_max) is between 380 nm and 420 nm. The spectral power transmission curve exhibits spectral transmissions (T) of radiation in a second wavelength range (Δλ_th) which are lower than an upper threshold spectral transmission (T_th,u). The second wavelength range (Δλ_th) is between 420 nm and 500 nm and the upper threshold spectral transmission (T_th,u) is smaller than the maximum spectral transmission (T_max). The maximum spectral transmission (T_max) is larger than 21%.