Ophthalmic lens
First Claim
Patent Images
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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Abstract
An ophthalmic lens having a main front face and a main rear face includes: an element for cutting off ultraviolet (UV) light incident on the main front face of the ophthalmic lens; an anti-reflection coating on the main rear face of the ophthalmic lens, having a weighted average reflection factor in the UV region of less than or equal to 7%; and at least one element for at least partially blocking the blue light in the wavelength region from 400 to 460 nanometers, preferably from 420 to 450 nanometers.
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Citations
22 Claims
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1. An ophthalmic lens with a front main face and a back main face, the ophthalmic lens comprising:
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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°
; andat 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, wherein said 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, and ii) 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%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An ophthalmic lens with a front main face and a back main face, said ophthalmic lens comprising:
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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°
; andat least one means blocking at least partially the blue light in the wavelength range extending from 400 to 460 nanometers, said blue-light blocking means being a blue-light blocking filter formed on at least one main face of the lens, wherein said blue-light blocking filter 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 in the range of 360 nm to 400 nm, and ii) 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 420 nanometers to 450 nanometers which is higher than or equal to 5%.
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22. An ophthalmic lens with a front main face and a back main face, said ophthalmic lens comprising:
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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°
; andat 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, wherein said blue-light blocking filter 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 nm, and ii) a full width at half maximum (FWHM) higher than or equal to 80 nm and lower than 150nm; 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 420 nanometers to 450 nanometers which is higher than or equal to 5%.
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Specification