Ultraviolet radiation and blue light blocking polarizing lens

Abstract From the Canadian patent

A lens (10) that substantially blocks horizontally polarized light and selectively blocks wavelengths between 300 and 549 nanometers. The selective blocking is controlled by a sharp cut-on filter (14) selected to cut-on at either 450, 500, 515, 530 or 500 nanometers. The specific, blocking and cut-on point selected is dependent upon the ultimate usage/environment of the lens (10). If a 450 cut-on filter is selected wavelengths between 300 and 449 nanometers are blocked before a cut-on occurs at 450 nanometers; similarly a 550 cut-on filter blocks, wavelengths between 300 and 549 nanometers before a cut-on occurs at 550 nanometers. The lens (10) also allows 30 to 40 percent of wavelengths …