Essilor Canada is working to ensure blue light protection is more widely available. “We brought together our products providing protection against blue light under the umbrella of The Essilor Blue Collection,” says Martine Ahier, marketing manager, Essilor. All Essilor lenses with a Crizal Pre- vencia coating or Transitions are part of the collection, as well as all Varilux and Eyezen+ lenses with embedded blue light protection. “These provide wearers with three main benefits, including optimal balance between harmful blue-violet light protection and lens clarity, up to three times more protection than a standard clear lens, and selective filtration that lets essential blue-tur- quoise light to pass through.” Overexposure to the flickering and glare from blue light may contribute to eyestrain and headaches. “Because we are living longer and are increasingly dependent on artificial light sources and digital devices, our exposure to blue light is growing, and so is the risk for discomfort.” Essilor notes there is a growing inter- est in blue light protection. “Typing ‘blue light’ in Google shows us this is of real interest with over seven billion results appearing today when searching for that information,” says Ahier. “At this time, we estimate that even if only 11 per cent of corrected consumers have blue-filtering lenses in Canada, 72 per cent of them are concerned about blue light exposure.” Sources of blue light include the sun, TVs, smartphones, electronic devices, as well as fluorescent and LED lighting. 26 OPTICAL PRISM | March 2019 Transitions Optical lenses work to protect from all of these exposures. “Indoors, Transitions lenses filter harmful blue light emitted by artifi- cial sources, such as digital devices and LED lights. Outdoors, they darken to help provide even more protection from harmful blue light, intense glare, and UV rays from the sun,” says Isabelle Tremblay-Dawson, director of business development, Transitions. “Our most popular lenses, Transitions Signature, block at least 20 per cent of harmful blue light indoors and over 85 per cent of harmful blue light out- doors. Transitions XTRActive lenses block at least 34 per cent indoors and 88 to 95 per cent outdoors, while Transitions Vantage lenses block 34 per cent indoors and over 85 per cent outdoors.” Lenses that protect against high-en- ergy blue light have been a priority for independent Canadian distributor Centennial Optical. “We are seeing more consumers ask- ing for more information about blue light protection, and they have three main concerns related to blue light: eye strain, sleep deprivation and potential long-term retinal damage,” says Rick Leroux, director of market- ing and communications for lenses. Centennial provides a great selection of lens and coating options for protec- tion against blue light. “Anti-blue light coatings reduce the amount of high energy visible (HEV) light transmitted by reflecting a por- tion of this part of the light spectrum off the front surface of the lens,” says Leroux. “Ultra-violet and HEV light are prevented from reflecting off the back surface of the lens with AR coating that allows the light to be transmitted through the lens, rather than reflected directly back to the eye.” Centennial offers several coating op- tions, including CHC AR Blocker UV, as a custom coating option for all plastic lenses. For greater filtering of HEV light, Centennial offers its CHOICE BluSe- lect lenses. “These are virtually clear lenses that have blue light-blocking molecules embedded in the lens material,” says Leroux. Centennial offers other lens products for extended computer use and close viewing of devices, such as tablets and smartphones.