Ophthalmic lens

Patent metadata

Field	Value
Publication number	US-2015234208-A1
Application number	US-201514689271-A
Country	US
Kind code	A1
Filing date	Apr 17, 2015
Priority date	May 16, 2012
Publication date	Aug 20, 2015
Grant date	—

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.

First claim

1 . An ophthalmic lens having a front main face and a back main face 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%; and at least one means blocking at least partially the blue light in the wavelength range extending from 400 to 460 nanometers and preferably from 420 to 450 nanometers.

2 . The ophthalmic lens as claimed in claim 1 , characterized in that the means for cutting off UV light arriving on the front main face cuts off 90% or more of the UV light.

3 . The ophthalmic lens as claimed in claim 1 , characterized in that the means for cutting off UV light arriving on the front main face consists of a lens substrate, a lens substrate in which one or more UV absorbers are dispersed, a UV-absorbing coating placed on the front main face, a UV-reflecting coating placed on the front face or a combination of these means.

4 . The ophthalmic lens as claimed in claim 1 , characterized in that the blue-light blocking means blocks from 5 to 50% of the blue light in the wavelength range from 400 to 460 nanometers.

5 . The ophthalmic lens as claimed in claim 1 , characterized in that the blue-light blocking means blocks from 5 to 50% of the blue light in the wavelength range from 420 to 450 nanometers.

6 . The ophthalmic lens as claimed in claim 1 , characterized in that the blue-light blocking means is a blue-light blocking dye incorporated in the lens or a blue-light blocking filter formed on at least one main face of the lens.

7 . The ophthalmic lens as claimed in claim 1 , characterized in that the blue-light blocking means is a blue-light blocking filter formed on a main face of the lens and that provides the main face comprising said filter with the following property:
for an angle of incidence θ ranging from 0° to 15° and for an angle of incidence 0′ ranging from 30° to 45°, a parameter Δ(θ,θ′) defined by the relation Δ(θ,θ′)=1−[R θ′ (435 nm)/R θ (435 nm)], so that this parameter Δ(θ,θ′) is higher than or equal to 0.5 and preferably higher than or equal to 0.6, where
R θ (435 nm) represents the reflectivity value of the main face comprising said filter at a 435 nanometer-wavelength for the angle of incidence θ, and
R θ′ (435 nm) represents the reflectivity value of the main face comprising said filter at a 435 nanometer-wavelength for the angle of incidence θ′.

8 . The ophthalmic lens as claimed in claim 7 , characterized in that the angle of incidence θ=15° and the angle of incidence θ′=45°.

9 . The ophthalmic lens as claimed in claim 7 , characterized in that the blue-light blocking filter furthermore provides the main face comprising said filter with the following property:
a spectral reflectivity curve for an angle of incidence ranging from 0° to 15° having:
a reflectivity maximum at a wavelength lower than 435 nanometers; and
a full width at half maximum (FWHM) higher than or equal to 70 nm, preferably higher than or equal to 75 nm and better still higher than or equal to 80 nm and lower than 150 nm, preferably lower than or equal to 120 nm and better still lower than or equal to 110 nm.

10 . The ophthalmic lens as claimed in claim 1 , in which the average light reflection factor (R v ) on each of the main faces of the ophthalmic lens is lower than or equal to 2.5% and preferably lower than or equal to 1.5%.

11 . The ophthalmic lens as claimed in claim 1 , characterized in that the weighted average reflection factor in the UV of the antireflection coating on the back main face is lower than or equal to 6%, preferably lower than or equal to 5%, better still lower than or equal to 4.5% and ideally lower than or equal to 3.5%.

12 . The ophthalmic lens as claimed in claim 1 , characterized in that the blue-light blocking means is an interference filter.

13 . Spectacle glass formed from an ophthalmic lens according to claim 1 , especially in that it is chosen from clear glasses, processed glasses, sun glasses and photochromic glasses.

14 . The ophthalmic lens as claimed in claim 2 , characterized in that the means for cutting off UV light arriving on the front main face consists of a lens substrate, a lens substrate in which one or more UV absorbers are dispersed, a UV-absorbing coating placed on the front main face, a UV-reflecting coating placed on the front face or a combination of these means.

15 . The ophthalmic lens as claimed in claim 8 , characterized in that the blue-light blocking filter furthermore provides the main face comprising said filter with the following property:
a spectral reflectivity curve for an angle of incidence ranging from 0° to 15° having:
a reflectivity maximum at a wavelength lower than 435 nanometers; and
a full width at half maximum (FWHM) higher than or equal to 70 nm, preferably higher than or equal to 75 nm and better still higher than or equal to 80 nm and lower than 150 nm, preferably lower than or equal to 120 nm and better still lower than or equal to 110 nm.

Assignees

• Essilor Int

Inventors

• De Ayguavives Francisco
• Maury Helene

Classifications

• G02C7/104

  having spectral characteristics for purposes other than sun-protection · CPC title

• G02B5/283

  designed for the ultraviolet · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02B5/26

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• G02B1/11 Primary

  Anti-reflection coatings · CPC title