Florida Patent of the Month – March 2021

There are many reasons why someone might want to block certain wavelengths of light from their vision. Sunglasses are pigmented and dim all wavelengths to make it easier to see outside and protect our eyes from UV. Blue-light blocking lenses help to reduce eye strain when working with screens for long periods of time. Golfers use glasses which create a greater contrast with green wavelengths and can more easily see golf balls in the distance. These applications typically involve a colour or film of pigments which block the desired wavelengths being infused into the lens of glasses. However they all have some limitations, where the wavelengths blocked are often a wider range than desired. Everix, Inc. has created a film which can be attached to lenses and is capable of blocking wavelengths in small ranges for a more customized filtration.

The flexible film is made of a multi-layer interference filter. One layer is made to reduce the light transmission for a selected range of wavelengths. The thin layers contain optical materials thinner than the wavelength of light to be filtered. They use interference effects to filter the light spectrum. Conventional lenses, like sunglasses, use absorption to block light, which is less selective. The back or front most layer has static cling properties to help it easily adhere to the lens. The filter film can be cut to suit any eyeglass shape and the adhesive layer allows it to connect to any curvature. This method enhances the protection from desired wavelength ranges without impacting the remaining wavelengths.

About Everix, Inc

EVERIX’s ultra-thin, all-plastic optical filters feature total thickness in the range 100 – 500 microns, suitable for device miniaturization and optical path length reduction. Everix’s non-deposition manufacturing technology allows for customization of filter curves with blocking OD in the range 2 – 6.

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