Ophthalmic lens
View Patent ↗An ophthalmic lens having a front and back face, at least one including a filter, which provides the main face/filter with the following properties: an average blue reflectance factor within a wavelength ranging from 420-450 nm, which ≧5%, for an angle of incidence θ ranging from 0°-15°, a spectral reflectivity curve for θ, having: a maximum reflectivity at a wavelength <435 nm, and a full width at half maximum ≧80 nm, and for θ ranging from 0°-15° and for θ′ ranging from 30°-45°, a parameter Δ(θ,θ′)=1−[R θ′ (435 nm)/R θ (435 nm)], such that Δ(θ,θ′)≧0.6, where R θ (435 nm) represents the reflectivity value of the main face/filter at a wavelength of 435 nm for θ, and R θ′ (435 nm) represents the reflectivity value of the main face/filter at a wavelength of 435 nm for θ′.
1. An ophthalmic lens having a front main face and a back main face, at least one of both main faces comprising a filter, which provides the main face comprising said filter with the following properties:
an average blue reflectance factor (R m,B ) within a wavelength range of from 420 nanometers to 450 nanometers, which is higher than or equal to 5%, for an angle of incidence ranging from 0° to 15°,
a spectral reflectivity curve for an angle of incidence ranging from 0° to 15°, this reflectivity curve having:
a maximum reflectivity at a wavelength of less than 435 nanometers, and
a full width at half maximum (FWHM) higher than or equal to 80 nanometers, and
for an angle of incidence θ ranging from 0° to 15° and for an angle of incidence θ′ 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)], in such a way that this parameter Δ(θ,θ′) is 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′.
2. The ophthalmic lens according to claim 1 , wherein the parameter Δ(θ,θ′) is defined for an angle of incidence θ=15° and for an angle of incidence θ′=45°.
3. The ophthalmic lens according to claim 1 , wherein the average blue reflectance factor (R m,B ) is higher than or equal to 10%.
4. The ophthalmic lens according to claim 1 , wherein the maximum reflectivity is observed at a wavelength lower than or equal to 410 nm.
5. The ophthalmic lens according to claim 1 , wherein the full width at half maximum is higher than or equal to 90 nanometers.
6. The ophthalmic lens according to claim 1 , wherein the full width at half maximum is lower than or equal to 150 nanometers.
7. The ophthalmic lens according to claim 1 , wherein the average luminous reflectance factor (R v ) on the main face of the ophthalmic lens comprising the filter is lower than or equal to 2.5%.
8. The ophthalmic lens according to claim 1 , wherein the average luminous reflectance factor (R v ) on each of the main faces of the ophthalmic lens is lower than or equal to 2.5%.
9. An ophthalmic lens according to claim 1 , wherein the filter is an interference filter.
10. The ophthalmic lens according to claim 9 , wherein the filter comprises a number of layers lower than or equal to 11.
11. The ophthalmic lens according to claim 1 , wherein the filter has a total thickness lower than or equal to 700 nanometers.
12. The ophthalmic lens according to claim 1 , wherein the ratio [R 15° (435 nm)−R 15° (480 nm)]/R 15° (435 nm) is higher than or equal to 0.8, where R 15° (435 nm) and R 15° (480 nm) represent respectively the reflectivity of the main face comprising said filter at 435 nm and at 480 nm, for an angle of incidence of 15° on this main face.
13. The ophthalmic lens according to claim 1 , wherein the reflectivity value at the maximum level of reflectivity of the main face comprising said filter, for an angle of incidence of 15°, is at least 1.5 times higher than the reflectivity value of the same main face, at a wavelength of 435 nm and for an angle of incidence of 15°.
14. The ophthalmic lens according to claim 1 , wherein the filter is formed on the front main face of the ophthalmic lens.
15. The ophthalmic lens according to claim 14 , wherein the back main face of the ophthalmic lens. comprises an antireflection coating efficient within the UV region.
16. The ophthalmic lens according to claim 1 , wherein the parameter Δ(θ,θ′) is higher than or equal to 0.65.
17. The ophthalmic lens according to claim 1 , wherein the parameter Δ(θ,θ′) is higher than or equal to 0.7.
18. The ophthalmic lens according to claim 1 , wherein the parameter Δ(θ,θ′) is higher than or equal to 0.75.
19. The ophthalmic lens according to claim 1 , wherein the average luminous reflectance factor (R V ) on the main face of the ophthalmic lens comprising the filter is lower than or equal to 1.5%.
20. The ophthalmic lens having a front main face and a back main face, at least one of both main faces comprising a filter, which provides the main face comprising said filter with the following properties:
an average blue reflectance factor (R m,B ) within a wavelength range of from 420 nanometers to 450 nanometers, which is higher than or equal to 5%, for an angle of incidence ranging from 0° to 15°,
a spectral reflectivity curve for an angle of incidence ranging from 0° to 15°, this reflectivity curve having:
a maximum reflectivity at a wavelength of less than 435 nanometers, and
a full width at half maximum (FWHM) higher than or equal to 70 nanometers, and
for an angle of incidence θ ranging from 0° to 15° and for an angle of incidence θ′ 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)], in such a way that this parameter Δ(θ,θ′) is higher than or equal to 0.5, 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′ and
for an angle of incidence ranging from 0° to 15°, a parameter Δ spectral defined by the relation Δ spectral =1−[R 0°-15° (480 nm)/R 0°-15° (435 nm)], in such a way that this parameter Δ spectral is higher than or equal to 0.8, where
R 0°-15° (480 nm) represents the reflectivity value of the front main face at a 480 nanometer-wavelength for the relevant incidence, and
R 0°-15° (435 nm) represents the reflectivity value of the front main face at a 435 nanometer-wavelength for the relevant incidence.
21. The ophthalmic lens according to claim 20 , wherein the parameter Δ(θ,θ′) is defined for an angle of incidence θ=15° and an angle of incidence θ′=45°.