Blue light protection glasses / mixed Wondering what is blue light? Blue light is emitted by all light sources, whether natural (sunlight) or artificial (fluorescent lighting bulbs, LED lighting bulbs, LEDs in smartphones/tablets/computer screens/television ). French people spend on average more than 7 hours in front of a screen (computer, smartphones, TV, etc.). Various studies have shown that blue light, with a maximum wavelength of 460 nm, disrupts the sleep cycle (lack of sleep, etc.) in humans. Indeed, the blue light emitted by LEDs (computer screens, televisions, tablets) activates the non-visual photosensitive receptors of the retina to a much greater extent than the white light of a fluorescent lamp. Late exposure to blue-enriched light causes visual fatigue, a delay in falling asleep and generally a significant lack of sleep. Thanks to their exclusive blue light filtration technology, these glasses provide all people without prescription with an optimal level of protection in front of all their screens. Features Unisex glasses. Dimensions approx. : 14 x 14 x 4.5 cm. Material: PVC.