Circadian rhythm restoring blue blockers

Abstract

Methods and devices are described that relate to spectral filters and associated eyewear that are specifically designed to mitigate the disruptive effects of electric lighting on the circadian clock that can cause sleep deprivation and other physiological and psychological maladies. An example wearable device for viewing a real or virtual environment includes one or more windows positioned and a spectral filter that comprises a coating positioned on one or more sections of the one or more windows. The spectral filter includes a multi-layer stack of dielectric material with alternate high and low indices of refraction. The number of the layers and a thickness of each layer are selected to provide designed transmission and blocking characteristics to block circadian-rhythm-disruptive spectra from reaching the wearer's eyes while providing viewability of the real or virtual environment by allowing light outside of the circadian-rhythm-disruptive spectra to reach the wearer's eyes.