Description Features Blue AND Green Light Blocking Glasses Our scientifically-designed-and-manufactured blue and green light blocking glasses not only block blue light but make you look good while doing it! Featuring our custom-designed Noctural Red 550 Lens, these glasses have been specifically designed and proven to block 100% of blue and green light from 400-550nm.  This is the exact range of blue and green light shown in scientific studies and trials to lower melatonin levels and lower sleep quality. Its Not Just Blue...Its Also Green... Green light is right next to blue light on the visible colour spectrum, this means that the "melatonin disruption zone" also extends into the green light range. Green light up to 550nm at night can also send daytime signals to the brain. For optimal night-time protection we need to remove 100% of blue AND green light up to 550nm. Be careful, as there are many other "blue blocking" glasses on the market that have not been verified to block all the required blue and green light wavelengths which is essential for these glasses to be effective and provide adequate night-time protection! NightFall glasses use the world's most advanced blue and green light blocking lenses designed for after-dark use, making them much more effective at reducing the harmful effects of blue and green light and improving your sleep. Noctural 550 Ren Lens: 100% of blue and green light from 400nm - 550nm is blocked Premium style fashionable frames made with spring hinges Impact and scratch resistant Foldable carry case and lens cloth included Specifically designed to help you sleep by blocking harmful blue and green light thats lowers melatonin levels Use after sunset when you are exposed to artificial light, to enjoy improved quality of sleep Dimensions: Lens Width - 49mm Lens Height - 43mm Arms - 140mm Bridge - 15mm Frame Width - 135mm