US Patent 10175508 Photochromic optical lens with selective blue light attenuation

The present invention is a photochromic eyewear lens product comprising photochromics material(s) and selective filtering agent(s) that selectively attenuate a portion of the blue light spectral region between 400 nm and 500 nm. The selective attenuation preferably comprises a maximum reduction in transmittance in the filtered region of about 10-25% T relative to at least one adjacent spectral region when the lens product is in the rest state, and a maximum reduction in transmittance that is measurably less than the transmittance of at least one adjacent region of the visible spectrum when the lens product has darkened in the activated state.