Light is composed of photons as basic particles, with particle and volatility, and different colors of light have different energies. The visible spectrum begins with red light, consisting of low-energy waves, which are the light with the highest energy in the visible spectrum, which penetrates the retina of the eye. The higher the energy, the greater the stimulation of the human eye.

　　High energy light is vital to everyday life. We get high-energy visible light from the sun, which helps us regulate our sleep patterns. During the day, the light that enters our eyes releases enzymes in the morning, causing melatonin levels to drop and helping us to wake up. Melatonin is the most important hormone that regulates our biological clock, but the blue light emitted from the screen before going to sleep inhibits the amount of melatonin released in the body. Melatonin is reduced and the body can hardly fall asleep.

　　Artificial blue light is a high-energy visible light emitted by modern smart device screens in the range of 380-500 nm. It also becomes HEV, which is light that can directly penetrate the lens of the eye and reach the retina. Undoubtedly, with the continuous advancement of technology, we spend an average of more and more time on smart devices every day. This is why many people feel dry, itchy, and sometimes even with headaches.

　　Children under the age of 14 have their corneas not fully developed and lack the protection of adult eyes, and children who use tablets and mobile phones that emit high-energy blue light will face special risks. Long-term exposure to HEV is the most important reason for increasing myopia in children. As you age, blue light not only penetrates into the retina at the back of the eye, it gradually causes eye fatigue, dry eyes and other symptoms over time.

　　In modern society, the frequency of exposure to high-energy blue light is gradually increasing. In the long run, the possibility of early onset of advanced macular degeneration is increased. This problem must be corrected by surgery. Moreover, recent studies have shown that the decrease in melatonin released by blue light in the pituitary gland is positively correlated with the increased risk of obesity and certain cancers.