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Blue light is everywhere and is naturally emitted from the sun as part of the visible light spectrum. Our body uses blue light to regulate our natural sleep and wake cycles, known as the circadian rhythm. Natural blue light can be beneficial during the day because it can boost alertness and elevate your mood.
But besides the sun, we are constantly exposed to artificial blue light throughout the day. From when you wake up in the morning until you lay your head down at night. The first thing you probably do when you wake up in the morning is check your phone. Next, you head to the bathroom where you are exposed to the LED light bulbs or compact fluorescent lights bulbs while you shower or brush your teeth. After that you probably eat breakfast while you scroll thru your phone or watch the news. In the office, you are work in front of a computer monitor for the whole day while sitting under fluorescent or LED lights. During your lunch break, you probably scroll thru your phone again. Afterwork, you head home and eat dinner while watching television. And before sleep, you probably lie in bed scrolling thru your phone or tablet. All that screen time and exposure to blue light can negatively impact our health.
Some may argue that blue light exposure you receive from digital screens is small compared to the amount of exposure from the sun, BUT the close proximity of the screens and the length of time spent looking at them is of great concern for human health and particularly potential harmful risk for the eye.