There is an increasing awareness that blue light has significant impacts to our circadian rhythms and sleep. Blue light in the range of 460-480nm has been shown to have the strongest impact on the sleep hormone Melatonin being secreted at night.
Blue light also exists in the 415-455nm range. This has less an effect on circadian rhythm, Melatonin secretion, and sleep, but has more long term serious impacts to eye health.
Blue light is in this range is harmful, because it's the highest energy wavelength of visible light. This energy is able to penetrate all the way to the back of the eye, through the eyes' natural filters, killing cells in our retinas which causes permanent damage to our sight. The effects of this blue light are cumulative and can eventually lead to serious eye diseases like macular degeneration.
Even though blue light is nothing new, the biggest emerging issue is the amount of blue light exposure that we get on a daily basis through digital device use. Our modern lifestyles sees us being constantly exposed to smartphones, tablets, computer screens, and big screen TVs for the large part of the day (and night).
Over-exposure to blue light in this range has also been shown to cause a number of other issues such as headaches, dry eyes, and eye strain.
So what can we do about this? The simple answer is to avoid blue light in this harmful range as much as possible. However we understand in today’s world blue light exposure from electronic devices is unavoidable; therefore we recommend the following strategies to protect your eyes:
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