The EMISSARY blue light blocking computer glasses feature squared off lenses for an angular look inspired by the past and designed for the future, with balanced spring hinges and adjustable floating nose pads for a comfortable fit, made from lightweight, European hand-crafted aluminum/magnesium alloy, using proprietary patented GUNNAR lens material that blocks harmful blue light and 100% UV light, equipped with anti-reflective coatings and silicone hard coatings to prevent scratching, suitable for Asian fit, with a prescription range of -5 to +4; specifications include lens width of 55 mm, lens height of 33 mm, nose width of 18 mm, frame width of 132 mm, temple length of 138 mm, and a weight of 18 grams (without packaging); included with purchase are a clamshell glasses case, microfiber pouch, microfiber cleaning cloth, and a 24-month warranty.