In today’s increasingly digital world, most of us spend a significant part of our day looking at a computer screen, only to go home and spend our down time doing more of the same on a mobile phone. All this screen time can affect our eye health and sleep patterns. But why is that? A big reason is what’s known as blue light.
What is blue light?
The only source of light for our earliest ancestors, of course, was the sun. Then came light from fire, candlelight, oil lamps, and eventually the electric lightbulb. Fast forward to today, and now the world is flooded with light from a variety of sources.
Smartphones, televisions, and multiple digital devices emit what is known as blue light, a color of light on the visible spectrum.
Each color of light in the visible spectrum has differing amounts of energy and wavelengths. Red light has longer wavelengths and is made up of less energy. On the other end of the spectrum, there’s blue light. Blue light has a higher concentration of energy and has shorter wavelengths.
Sunlight, which contains all colors of the visible spectrum and is called white light, is our biggest source of blue light. Because of the advent of technology, we also get blue light from other sources like:
Compact fluorescent light (CFL) bulbs
Computer, smartphone, television, and tablet screens
But is all blue light bad?