Optical grade CR39 lens. Superior hard coat for anti-scratch durability. Anti-reflective coatings to mitigate reflections and glare. Super hydro-phobic and oleo-phobic coatings for anti-smudge. Handcrafted acetate designs utilizing state of the art CNC and finishing for fit, function, and durability. All Caddis readers block blue light. Our included HEV coating blocks harmful high energy light screens emit. We're pro cool shit you're doing on your screens. We're anti eye strain, headaches & disrupted sleep. Block, Blue, Light.