OPHTHALMIC LENS Russian patent published in 2017 - IPC G02C7/10 A61F2/14 

FIELD: physics.

SUBSTANCE: ophthalmic lens at least one of the main surfaces of which contains a filter. The filter has the following properties: average reflection coefficient of blue light in the wavelength range from 420 nm to 450 nm is greater than or equal to 5% for the angle of incidence in the range from 0° up to 15°; the spectral reflectance curve for the angle of incidence in the range from 0° up to 15° has a maximum reflectance at a wavelength of less than 435 nm and a full width at half-amplitude level that is greater than or equal to 80 nm, and for the angle of incidence θ in the range from 0° up to 15° and for the angle of incidence θ' in the range of 30° up to 45° parameter Δ(θ,θ'), defined by the ratio Δ(θ,θ')=1-[R_θ'(435 nm) / R_θ(435 nm)] is greater than or equal to 0.6, where R_θ(435 nm) and R_θ'(435 nm) is the reflectivity of the main surface containing the filter at a wavelength of 435 nm for the angles θ and θ'.

EFFECT: to ensure the transmission of all light radiation, reduce the transmission of blue light in the wavelength range from 420 nm to 450 nm and high transmission in the wavelength range from 465 nm to 495 nm.

21 cl, 5 dwg, 1 tbl