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What is blue light?

Blue light is a color in the visible light spectrum that can be seen by the human eye and is responsible for the blue of the sky. It is adjacent to ultraviolet in the spectrum of sunlight, high energy, and has a wavelength ranging from 400 to 500 nm. In recent years, blue light has also come indoors. It is emitted by electrical and electronic devices such as smartphones, tablets and TV screens. The intensity of blue light emitted by screens can reach 80% of the intensity of a blue sky – and the amount of time we spend in front of a screen is increasing rapidly.

Why the concern now?

Very few UV filters currently extend protection into the blue light range. However, there is already strong evidence that concentrated light of this wavelength has adverse ef ... ...