DIMENSIONS:Temple Length: 5 1/8 inches (130mm)Overall Width: 5 5/16 inches (135mm)Lens Width: 2 1/16 inches (52mm)Lens Height:1 1/8 inches (28mm)Frame Height: 1 1/4 inches (32mm)Nose Bridge Width: 1/2 inches (13mm)Spring Hinge: YesHead Size: Medium to wider. Rx-able frame8-in-1 Coating TechnologyReducblu computer glasses lens are made with advanced 8 in 1 (Hardened/SiO2/ZrO2/SiO2/ZrO2/ITO/SiO2/User) coating technology to effectively block electromagnetic radiation, filter out high energy blue light and other harmful light, imitate natural condenser, reduce glare and improve contrast, and restore true colors.Information for blue light:Blue light wave is one of the shortest, highest-energy. It is actually everywhere.Natural blue light vs. Artificial blue light:Natural blue light comes from the sun. Our body uses blue light from the sun to regulate our natural circadian rhythm (sleep and wake cycles), boost alertness, heighten reaction times, elevate moods, and increase the feeling of well being.Artificial sources of blue light include digital screens such as TVs, computers, smart phones, and fluorescent and LED lights. CARETo avoid damage, never contact with acid, and avoid using paper, towels, clothing, alcohol, household detergents or soaps to clean your glasses. While a few mild soaps don't harm lenses, today's extra strength soaps are strong enough to slowly disintegrate lens coatings.