US Patent 7866812 Optical inserts for goggles or facemasks

An optical insert is disclosed for use in a pair of goggles, behind a facemask, or behind other eyewear. The insert is held in place by forces from the goggles, facemask, or other eyewear. These forces include forces directed generally inward against the left and right ends of the insert and a force directed backward against a middle portion of the insert.