Our slim rectangle flip-ups are the perfect match for today’s low profile eyewear frames. These professional grade flip-ups feature scratch-resistant Polaré polarized amber lenses that effectively at absorb most blue light waves. By filtering the majority of scattered blue light, amber lenses sharpen visual acuity, improving depth perception and contrast. Amber is a darker tint that is popular for activities requiring improved object definition in bright to moderate light conditions. Transmits 14% of visible light.