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Blue-light: Sunlight is the main source of blue light, and being outdoors during the daytime is where we get the most exposure to it. However, there's also man-made artificial, indoor sources of blue light, which include fluorescent lighting, and LED/ LCD TV lighting. When you are looking at a computer or cellphone screen as well as other digital devices that emit blue light, chances are that you'll get digital eye strain. When you block blue light, you eliminate these problems. You'll get optimum clarity and put less stress on your eyes and body. BLU BLCK glasses will help you see with more clarity and can give you greater protection. In addition, you may also be wearing them because you want to stand out look good and stylish. When you wear BLU BLCK glasses people will will take a second look at you and ask about them. Go and order your pair of BLUBLCK's now and feel the difference!