Dangers of Blue Light
Blue light is all around us. It exists naturally from the sun as well as artificial light sources, including digital screens like your smartphone, tablet or computer. Recent studies have shown that over exposure to blue light from digital screens may have detrimental effects on our health such as digital eye strain, sleeping disorders and increase the risk of macular degeneration.
Blue light also known as high energy visible blue light (HEV) has a wavelength of between 380nm and 500nm: making it one of the shortest, high energy wavelengths. Recent studies have shown that prolonged exposure to the blue violet light (400nm-440nm) can contribute to retinal damage and macular degeneration - an irreversible loss of vision.
Some blue light is good for us
Blue light, in moderation can be beneficial to us. It exists naturally in our environment from the sun, regulating our circadian rhythm, telling our body when to wake up and go to sleep. Our eyes have been designed to handle the energy levels of the sun, however prolonged exposure to the artificial blue violet light can cause digital eye strain and increase the risk of macular degeneration – the leading cause of blindness in industrialised nations.
Another reason you are tired
Blue light can also lead to other forms of fatigue beyond eyestrain. Blue light during the day is beneficial because it boosts attention, reaction times and mood. However at night, artificial blue light disrupts the circadian rhythm that causes the natural release of melatonin that helps us sleep. Because the blue light tricks our brain into believing it’s still daytime, falling asleep can be more difficult and we don’t sleep as deeply. Circadian disruption can also lead to other more serious side effects, including an increase in obesity and depression.