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The benefits and dangers of blue light for your eyes You probably know about the dangers of ultraviolet (UV) light, but do you know about blue light? Where does blue light come from? Blue light is ever-present in your environment, both outdoors and indoors: • Naturally produced by the sun, whatever the season • Used in fluorescent light bulbs • Emitted by LEDs present in computer screens, tablets, smartphones, etc. What is blue light? VISIBLE B LU E LIGHT UV Light spectrum. Blue-Violet, “harmful light” Blue-Turquoise, “essential light” • close to UV • penetrates deep into the eye • dangerous • less energetic • contributes to well-being • beneficial How can Blue-Violet light harm you? Harmful Blue-Violet light damages the retina, the part of your eye where images are formed. Long-term damage can lead to serious eye conditions, including Age-related Macular Degeneration (AMD), the leading cause of visual impairment in the Western world. Why do you need Blue-Turquoise light? Like all visible light, Blue-Turquoise helps you perceive colours and shapes. Blue-Turquoise light is also a natural form of light therapy that is essential for your body. It helps regulate your everyday sleep cycle, keeping you energised and alert. Furthermore, it triggers your pupillary reflex, one of the eye’s natural safety devices. This means exactly the right amount of light enters your eye. Get the best from blue light. Essilor’s Crizal® Prevencia™ clear lenses use an exclusive technology to selectively filter light. UV rays and harmful blue-violet light are virtually eliminated. Essential BlueTurquoise light passes through. The lens is clear and can be worn for visual correction. Ask your eye care professional for more details. Sources: The Benefits and dangers of Blue Light, Christian Sotti; Essilor France fait de la santé visuelle une priorité, Communiqué de presse Essilor France, March 2013; WHO, World Health Organization Blue light is part of visible light and close to UV on the light spectrum. NON-VISIBLE