Colored blue blockers

A spectral filter for use in an eyewear for restoring circadian rhythm, comprising:

• a multi-layer stack coating on a substrate, the multi-layer stack including a plurality of layers of dielectric material with alternate high and low indices of refraction such that a layer having a high index of refraction is positioned above or below a layer having a low index of refraction,
• wherein a number of the layers and a thickness of each layer are selected to provide designed transmission and blocking characteristics to block circadian-active spectra to be transmitted through the spectral filter,
• wherein the designed transmission and blocking characteristics include a contiguous blocking region within 455-495 nm band of wavelengths to within at least ±5 nm, and two contiguous transmission regions, a first one of the contiguous regions extending below 455 nm and a second one of the contiguous transmission regions extending above 495 nm,
• wherein the spectral filter is configured to block 98-100% of the spectral content in the contiguous blocking region, and transmit 80%-100% of the spectral content in the contiguous transmission regions,
• wherein the spectral filter includes an additional layer to effectuate a particular color,
• wherein the additional layer comprises an absorbing material with a specific absorption spectrum that in combination with the designed transmission and blocking characteristics of the spectral filter produces tristimulus values that correspond to the particular color,
• wherein the tristimulus values correspond to a pink color, and
• wherein the additional layer includes an inorganic pink pigment or sodium aluminum sulfosilicate with chemical formula Na8-x[(Al,Si)12]O24(Sy)2 in a polymer matrix.

A spectral filter for use in an eyewear for restoring circadian rhythm, comprising:

• a multi-layer stack coating on a substrate, the multi-layer stack coating including a plurality of layers of dielectric material with alternate high and low indices of refraction such that a layer having a high index of refraction is positioned above or below a layer having a low index of refraction,
• wherein a number of the layers and a thickness of each layer are selected to provide designed transmission and blocking characteristics to block circadian-active spectra to be transmitted through the spectral filter,
• wherein the designed transmission and blocking characteristics include a contiguous blocking region within 455-495 nm band of wavelengths to within at least ±5 nm, and two contiguous transmission regions, a first one of the contiguous transmission regions extending below 455 nm and a second one of the contiguous transmission regions extending above 495 nm,
• wherein the spectral filter is configured to block 98-100% of spectral content in the contiguous blocking region, and transmit 80%-100% of the spectral content in the contiguous transmission regions,
• wherein the spectral filter includes an additional layer to effectuate a particular color,
• wherein the contiguous blocking region extends from 455 nm to 495 nm, the first contiguous transmission region extends from 300 nm to 455 nm, and the second contiguous transmission region extends from 495 nm to at least 700 nm, all with a ±5 nm tolerance, and
• wherein each layer with the high index of refraction includes titanium dioxide (TiO2) and has a 2.35 index of refraction, each layer with the low index of refraction includes silicon dioxide (SiO2) and has a 1.45 index of refraction, and the multi-layer stack includes 81 layers.

A spectral filter for use in an eyewear for restoring circadian rhythm, comprising:

• a multi-layer stack coating on a substrate, the multi-layer stack including a plurality of layers of dielectric material with alternate high and low indices of refraction such that a layer having a high index of refraction is positioned above or below a layer having a low index of refraction,
• wherein a number of the layers and a thickness of each layer are selected to provide designed transmission and blocking characteristics to block circadian-active spectra to be transmitted through the spectral filter,
• wherein the designed transmission and blocking characteristics include a contiguous blocking region within 455-495 nm band of wavelengths to within at least ±5 nm, and two contiguous transmission regions, a first one of the contiguous transmission regions extending below 455 nm and a second one of the contiguous transmission regions extending above 495 nm,
• wherein the spectral filter is configured to block 98-100% of spectral content in the contiguous blocking region, and transmit 80%-100% of the spectral content in the contiguous transmission regions,
• wherein the spectral filter includes an additional layer to effectuate a particular color,
• wherein the contiguous blocking region extends from 455 nm to 495 nm, the first contiguous transmission region extends from 300 nm to 455 nm, and the second contiguous transmission region extends from 495 nm to at least 700 nm, all with a ±2 nm tolerance, and
• wherein each layer with the high index of refraction includes titanium dioxide (TiO2) and has a 2.35 index of refraction, each layer with the low index of refraction includes silicon dioxide (SiO2) and has a 1.45 index of refraction, and the multi-layer stack includes 121 layers.