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Ophthalmic lens

  • US 10,330,953 B2
  • Filed: 05/16/2013
  • Issued: 06/25/2019
  • Est. Priority Date: 05/16/2012
  • Status: Active Grant
First Claim
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1. An ophthalmic lens with a front main face and a back main face, the ophthalmic lens comprising:

  • a means for cutting off ultraviolet (UV) light arriving on the front main face of the ophthalmic lens;

    an antireflection coating, on the back main face of the ophthalmic lens, having a weighted average reflection factor in the UV lower than or equal to 7% for an angle of incidence of 30° and

    for an angle of incidence of 45°

    ; and

    at least one means blocking at least partially the blue light in the wavelength range extending from 400 to 460nanometers, said blue-light blocking means being a blue-light blocking filter formed on at least one main face of the lens,whereinsaid blue-light blocking filter is an interference filter and has the following properties;

    a spectral reflectivity curve for an angle of incidence ranging from 0°

    to 15°

    having;

    i) a reflectivity maximum at a wavelength lower than 410 nanometers, andii) a full width at half maximum (FWHM) higher than or equal to 70 nm; and

    the main face provided with the blue-light blocking filter has the ability to present, for an angle of incidence on said main face ranging from 0°

    to 15°

    , an average blue reflectance factor Rm,B within a wavelength range of from 420nanometers to 450 nanometers which is higher than or equal to 5%, andwherein the average luminous factor Rv on the main face of the ophthalmic lens comprising the filter is lower than or equal to 2.5%.

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