However, the human eye is sensitive to only one part of this spectrum: visible light, which is seen as colours: violet, indigo, blue, green, yellow, orange and red.  Blue light has a very short wavelength, and thus it produces a higher amount of energy.The sources of blue light include- the Sun, and it's artificial sources include electronic devices such as cell phones and laptop computers, as well as energy-efficient fluorescent bulbs and LED lights.In this present tech-savvy world, it would be irrelevant to say that our exposure to blue light has not been increasing. Most of us spend the majority of our waking hours staring at the digital screen, whether it's the computer at work, our personal cell phone, playing a video game, or just relaxing and watching TV. However, it is essential to understand what this exposure is doing to us.Blue light has both pros and cons. In its natural form, your body uses blue light from the sun to regulate your natural sleep and wake cycles.  This is known as your circadian rhythm. It also helps boost alertness, heighten reaction times, elevate moods, and increase the feeling of well-being. However, prolonged exposure to artificial blue light or blue light after sundown may cause retinal damage and contribute to age-related macular degeneration, which can lead to loss of vision; several types of cancer (breast, prostate), diabetes, heart disease, and obesity. Similarly, brain imaging researchers have found brain changes to be very similar in those addicted to their smartphones and other digital devices as those who are addicted to alcohol, cocaine, heroin, marijuana, meth and other drugs. Many studies have also shown that screen use increases depression, anxiety, and aggression, and can even lead to psychotic-like behaviour and a loss of touch with reality.