Materials and methods for mitigating the harmful effects of blue light
Provided herein are optically transparent materials configured to block an appropriate amount of incident blue light, such that when the materials are positioned in the optical path between environmental light and the retina of a user, the optically transparent materials reduce the amount of blue light from the environmental light that reaches the retina of a user. The materials can block an effective amount of blue light to minimize damage to retinal tissue while permitting transmission of an effective amount of maintain acceptable photopic vision, scotopic vision, color vision, and circadian rhythms.
1. Over the counter reading glasses comprising a first optical lens having a front face and a rear face, a second optical lens having a front face and a rear face, and a frame disposed about the first optical lens and the second optical lens;
wherein the first optical lens and the second optical lens have the same optical power with a set optical center;
wherein the front face of the first optical lens and the front face of the second optical lens exhibit a maximum reflectance in the visible spectrum of from 5% to 30% reflectance at a wavelength of from 430 nm to 470 nm; and
wherein the first optical lens and the second optical lens exhibit a yellowness index of 10 or less, as measured by ASTM E313-10.
2. The glasses of claim 1 , wherein the front face of the first optical lens and the front face of the second optical lens exhibit a maximum reflectance in the visible spectrum of from 10% to 30% reflectance at a wavelength of from 430 nm to 470 nm.
3. The glasses of claim 1 , wherein the first optical lens and the second optical lens exhibit a yellowness index of 7 or less, as measured by ASTM E313-10.
4. An optically transparent material having a front face and a rear face, the material comprising:
a substrate having a front surface and a rear surface; and
a first multilayer dielectric coating disposed on the front surface of the substrate;
wherein the front face of the material exhibits a maximum reflectance in the visible spectrum of from 5% to 30% reflectance at a wavelength of from 430 nm to 470 nm; and
wherein the material exhibit a yellowness index of 10 or less, as measured by ASTM E313-10.
5. The material of claim 4 , wherein the front face of the material exhibits a reflectance of from 2% to 18% at 400 nm, of from 5% to 30% reflectance at 450 nm, and of from 3% to 20% at 500 nm.
6. The material of claim 4 , wherein the front face of the material exhibits a maximum reflectance in the visible spectrum of from 10% to 30% reflectance at a wavelength of from 430 nm to 470 nm.
7. The material of claim 4 , wherein the front face of the material exhibits a reflectance of from 3% to 18% at 400 nm, of from 10% to 30% reflectance at 450 nm, and of from 4% to 20% at 500 nm.
8. The material of claim 4 , wherein the front face of the material exhibits a reflectance spectrum having a full width at half maximum of at least 75 nm.
9. The material of claim 4 , wherein the front face of the material exhibits a maximum reflectance in the visible spectrum at a wavelength of from 440 nm to 460 nm.
10. The material of claim 4 , wherein the front face of the material exhibits a reflectance of from 7% to 15% at 400 nm.
11. The material of claim 4 , wherein the front face of the material exhibits a reflectance of from 15% to 25% reflectance at 450 nm.
12. The material of claim 4 , wherein the front face of the material exhibits a reflectance of from 7% to 15% at 500 nm.
13. The material of claim 4 , wherein the first multilayer dielectric coating comprises from 6 to 10 dielectric layers.
14. The material of claim 13 , wherein the dielectric layers are each independently formed from a metal oxide selected from the group consisting of chromium oxide, zirconium oxide, silicon dioxide, and combinations thereof.
15. The material of claim 4 , wherein the first multilayer dielectric coating comprises a first dielectric layer comprising chromium oxide disposed on the front surface of the substrate.
16. The material of claim 4 , wherein the first dielectric coating comprises at least two dielectric layers comprising zirconium oxide.
17. The material of claim 4 , wherein the first dielectric coating comprises at least three dielectric layers comprising silicon oxide.
18. The material of claim 4 , further comprising a second multilayer dielectric coating disposed on the rear surface of the substrate.
19. The material of claim 18 , wherein the second multilayer dielectric coating comprises from 6 to 10 dielectric layers.
20. The material of claim 4 , wherein the material exhibits a yellowness index of 7 or less, as measured by ASTM E313-10.