Blue light is near the top of the visible light spectrum and very close to UV light. It is also referred to as high-energy visible or HEV light because it has short wavelengths. As recently as ten years ago, very few screens emitted blue light, but now it is a component of over 90% of digital devices. Blue light contributes to eye strain and suppresses the production of melatonin, a hormone that regulates the sleep cycle. Decreased melatonin may lead to insomnia and poor sleep, which, in turn, worsens symptoms of digital eye strain.
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