Gunnar glasses featuring yellow lenses. Ideal for eye comfort. • Recommended by doctors, our blue light blocking computer & gaming glasses (Patented Lens #9417460) protects your vision, reduces eye strain and headaches while viewing tablets, computers, TV, and phones • Unlike other blue light blocking glasses, GUNNAR developed the Blue Light Protection Factor, telling you exactly how much of the peak blue light spectrum (450nm) We're blocking. Not all blue light glasses in the market protects you from the strongest high-energy visible light.