Screen light & blue light

It’s all around us, but how does it affect us? And are we exposing ourselves to it more than what’s good for us?


Light is waves. Depending on the length of the waves and the frequency in which it moves, it emits a color. Blue light has the shortest wavelengths in the visible light spectrum and thus, produces the highest energy.

Because they are short and have high energy, they flicker more easily than longer, weaker wavelengths. The flickering creates a glare that can reduce visual contrast and affect sharpness and clarity. This may be one of the reasons for eyestrain, headaches and the discomfort you feel after hours in front of a computer screen.

Where is it?

Blue light is everywhere. When sunlight beams through the atmosphere, blue light collides with the air molecules and scatter all around us. This is what makes the sky blue. A blue sky, we all love that don’t we? However, we want to make a distinction between natural and artificial blue light. Natural light is what regulates our sleep and wake cycle, a.k.a the circadian rhythm. It makes us more alert, elevate moods and increase the feeling of well being. Artificial blue light is coming from sources such as cell phones, laptops, tablets and LED-lights.

What is so dangerous about it?

We are exposed more to blue light than what is natural. This makes our body function differently than intended. It can lead to disruption of the circadian rhythm, which in turn  increases the risk of severe diseases in the long run. Other negative effects of artificial blue light can be blurry vision, difficulty focusing, headaches and contribute to age-related macular disease.

Video by Christophe Tauziet

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