Eyewear with chroma enhancement
Some embodiments provide a lens including a lens body and an optical filter configured to attenuate visible light in a plurality of spectral bands. Each of the plurality of spectral bands can include an absorptance peak with a spectral bandwidth, a maximum absorptance, and an integrated absorptance peak area within the spectral bandwidth. An attenuation factor obtained by dividing the integrated absorptance peak area within the spectral bandwidth by the spectral bandwidth of the absorptance peak can be greater than or equal to about 0.8 for the absorptance peak in each of the plurality of spectral bands.
1. Eyewear comprising:
a lens comprising an optical filter configured to increase the average chroma value of uniform intensity light stimuli having a bandwidth of 30 nm transmitted through the lens at least partially within one or more filtered portions of the visible spectrum by attenuating a portion of the light transmitted by the lens in the one or more filtered portions of the visible spectrum, the chroma value being the C* attribute of the CIE L*C*h* color space;
wherein the lens has a gray appearance;
wherein at least one of the one or more filtered portions of the visible spectrum comprises a spectral range of about 440 nm to about 510 nm; and
wherein the increase in average chroma value comprises an increase compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter, within the bandwidth of each light stimulus, and wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is greater than or equal to about 5% within the spectral range of about 440 nm to about 510 nm, when outputs resulting from uniform intensity inputs having a bandwidth of 30 nm and a center wavelength within the spectral range are compared.
2. The eyewear of claim 1 , wherein the lens has a CIE chromaticity x value between about 0.3 and about 0.34.
3. The eyewear of claim 2 , wherein the lens has a CIE chromaticity y value between about 0.31 and about 0.36.
4. The eyewear of claim 1 , wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is between about 5% and about 20% within the spectral range of about 440 nm to about 510 nm, when outputs resulting from uniform intensity inputs having a bandwidth of 30 nm and a center wavelength within the spectral range are compared.
5. The eyewear of claim 1 , wherein the optical filter comprises one or more organic dyes.
6. The eyewear of claim 1 , wherein the optical filter is configured to increase the average chroma value of uniform intensity light stimuli having a bandwidth of 30 nm transmitted through the lens at least partially within a second filtered portion of the visible spectrum by an amount between about 2% and about 20%, and wherein the second filtered portion comprises a spectral range of about 540 nm to about 600 nm.
7. The eyewear of claim 1 , wherein the optical filter is configured to increase the average chroma value of uniform intensity light stimuli having a bandwidth of 30 nm transmitted through the lens at least partially within a third filtered portion of the visible spectrum by an amount between about 2% and about 20%, and wherein the third filtered portion comprises a spectral range of about 630 nm to about 660 nm.
8. Eyewear comprising:
a lens comprising an optical filter configured to increase the average chroma value of uniform intensity light stimuli having a bandwidth of 30 nm transmitted through the lens at least partially within one or more filtered portions of the visible spectrum by attenuating a portion of the light transmitted by the lens in the one or more filtered portions of the visible spectrum, the chroma value being the C* attribute of the CIE L*C*h* color space;
wherein at least one of the one or more filtered portions of the visible spectrum comprises a spectral range of about 440 nm to about 510 nm; and
wherein the increase in average chroma value comprises an increase compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter, within the bandwidth of each light stimulus, and wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is greater than or equal to about 20% within the spectral range of about 440 nm to about 510 nm, when outputs resulting from uniform intensity inputs having a bandwidth of 30 nm and a center wavelength within the spectral range are compared.
9. The eyewear of claim 8 , wherein the optical filter comprises one or more organic dyes.
10. The eyewear of claim 8 , wherein the optical filter is configured to increase the average chroma value of uniform intensity light stimuli having a bandwidth of 30 nm transmitted through the lens at least partially within a second filtered portion of the visible spectrum by an amount between about 2% and about 20%, and wherein the second filtered portion comprises a spectral range of about 540 nm to about 600 nm.
11. The eyewear of claim 8 , wherein the optical filter is configured to increase the average chroma value of uniform intensity light stimuli having a bandwidth of 30 nm transmitted through the lens at least partially within a third filtered portion of the visible spectrum by an amount between about 2% and about 20%, and wherein the third filtered portion comprises a spectral range of about 630 nm to about 660 nm.
12. Eyewear comprising:
a lens comprising an optical filter configured to increase the average chroma value of uniform intensity light stimuli having a bandwidth of 30 nm transmitted through the lens at least partially within filtered portions of the visible spectrum by attenuating a portion of the light transmitted by the lens in the filtered portions of the visible spectrum, the chroma value being the C* attribute of the CIE L*C*h* color space;
wherein the filtered portions of the visible spectrum comprise a first spectral range of 440 nm to 510 nm and a second spectral range of 540 nm to 600 nm;
wherein the increase in average chroma value comprises an increase compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter, within the bandwidth of each light stimulus, and wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is greater than or equal to 5% within the first spectral range and greater than or equal to 3% in the second spectral range, when outputs resulting from uniform intensity inputs having a bandwidth of 30 nm and a center wavelength within the spectral range are compared.
13. The eyewear of claim 12 , wherein the filtered portions of the visible spectrum comprises a third spectral range of 630 nm to 660 nm, and wherein the increase in average chroma value comprises an increase compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter, within the bandwidth of each light stimulus, and wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is greater than or equal to 5% within the third spectral range, when outputs resulting from uniform intensity inputs having a bandwidth of 30 nm and a center wavelength within the spectral range are compared.
14. The eyewear of claim 13 , wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is less than or equal to 20% within the third spectral range.
15. The eyewear of claim 12 , wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is less than or equal to 20% within the first spectral range.
16. The eyewear of claim 13 , wherein the increase in average chroma value compared to a neutral filter that uniformly attenuates the same average percentage of light as the optical filter is less than or equal to 20% within the second spectral range.
17. The eyewear of claim 12 , wherein the optical filter comprises one or more organic dyes.
18. The lens body of claim 12 , wherein the optical filter is configured to attenuate visible light in at least one of the first spectral range or the second spectral range such that at least one of the first or second spectral ranges comprises an absorptance peak with a spectral bandwidth, a maximum absorptance, and an integrated absorptance peak area within the spectral range, the spectral bandwidth being equal to the full width of the absorptance peak at 80% of the maximum absorptance of the absorptance peak;
wherein an attenuation factor of the absorptance peak in at least one of the first, second or third spectral range each is greater than or equal to about 0.8 and less than 1; and
wherein the attenuation factor of an absorptance peak is obtained by dividing the integrated absorptance peak area within the spectral bandwidth by the spectral bandwidth of the absorptance peak.