Optical filters affecting color vision in a desired manner and design method thereof by non-linear optimization
The invention generally relates to optical filters that provide regulation and/or enhancement of chromatic and luminous aspects of the color appearance of light to human vision, generally to applications of such optical filters, to therapeutic applications of such optical filters, to industrial and safety applications of such optical filters when incorporated, for example, in radiation-protective eyewear, to methods of designing such optical filters, to methods of manufacturing such optical filters, and to designs and methods of incorporating such optical filters into apparatus including, for example, eyewear and illuminants.
1. An optical filter comprising:
a first narrow-band dye having a peak absorption wavelength in a first spectral band between 570 nanometers and 600 nanometers and
a second narrow-band dye having a peak absorption wavelength in a second spectral band between 470 nanometers and 530 nanometers,
wherein
the peak optical density of the optical filter in the first spectral band is at least three times greater than the peak optical density in the second spectral band,
the luminous transmittance of the filter is between 40% and 80%, the red-green separation factor of the filter is greater than 1.0, and the luminous transmittance of the optical filter is defined as the weighted photopic transmittance through the filter of CIE Standard Illuminant D65 according to the CIE 1931 2-degree Standard Observer.
2. The optical filter of claim 1 , wherein the filter color is blue.
3. The optical filter of claim 1 , wherein the filter color is purple.
4. The optical filter of claim 1 , wherein the luminous transmittance of the filter is greater than 50%.
5. The optical filter of claim 2 , wherein the luminous transmittance of the filter is greater than 50%.
6. The optical filter of claim 3 , wherein the luminous transmittance of the filter is greater than 50%.
7. The optical filter of claim 1 , wherein the red-green separation factor of the filter is greater than 1.25.
8. The optical filter of claim 2 , wherein the red-green separation factor of the filter is greater than 1.25.
9. The optical filter of claim 3 , wherein the red-green separation factor of the filter is greater than 1.25.
10. The optical filter of claim 4 , wherein the red-green separation factor of the filter is greater than 1.25.
11. The optical filter of claim 5 , wherein the red-green separation factor of the filter is greater than 1.25.
12. The optical filter of claim 6 , wherein the red-green separation factor of the filter is greater than 1.25.
13. An ophthalmic spectacle lens comprising the optical filter of claim 1 , wherein the optical filter filters at least a 10 degree field of view.
14. An ophthalmic spectacle lens comprising the optical filter of claim 2 , wherein the optical filter filters at least a 10 degree field of view.
15. An ophthalmic spectacle lens comprising the optical filter of claim 3 , wherein the optical filter filters at least a 10 degree field of view.
16. An ophthalmic spectacle lens comprising the optical filter of claim 4 , wherein the optical filter filters at least a 10 degree field of view.
17. An ophthalmic spectacle lens comprising the optical filter of claim 5 , wherein the optical filter filters at least a 10 degree field of view.
18. An ophthalmic spectacle lens comprising the optical filter of claim 6 , wherein the optical filter filters at least a 10 degree field of view.
19. An ophthalmic spectacle lens comprising the optical filter of claim 7 , wherein the optical filter filters at least a 10 degree field of view.
20. An ophthalmic spectacle lens comprising the optical filter of claim 8 , wherein the optical filter filters at least a 10 degree field of view.
21. An ophthalmic spectacle lens comprising the optical filter of claim 9 , wherein the optical filter filters at least a 10 degree field of view.
22. An ophthalmic spectacle lens comprising the optical filter of claim 10 , wherein the optical filter filters at least a 10 degree field of view.
23. An ophthalmic spectacle lens comprising the optical filter of claim 11 , wherein the optical filter filters at least a 10 degree field of view.
24. An ophthalmic spectacle lens comprising the optical filter of claim 12 , wherein the optical filter filters at least a 10 degree field of view.