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Blue Light Cut Glasses: This product has been tested by JIS Japanese Standard Japanese Spectacles spread optics inspection Association. This product has been tested by the Japan Spectacular Optics Inspection Association. (*Measured with left lens) *JIS (Japan Industrial) standards are widely used in the world. The blue light emits a lot of LCD screens such as computers, televisions, smartphones, etc. using LEDs. The blue light has strong energy of light, so if you wear it for a long time, it will affect your eyes and disturb the inner clock. It is said that if you put the blue light in your eyes for a long time, it will not only flicker your vision and eye fatigue, but also reduce your body rhythm and cause sleep disorders. Blue light cut glasses reduce the amount of light from entering your eyes, reducing glare, flickering, and blurred; reducing eye fatigue when using a PC or smartphone.