What is the function of lens to block blue light

I believe everyone is familiar with glasses. They have many benefits for our human body, and there are many types of glasses, such as sunglasses, dark glasses, etc., including anti-blue light glasses. Blue light is harmful to the human body, and our anti-blue light glasses effectively block the radiation of blue light to us. So what is the role of the lenses in anti-blue light?

Anti-blue light glasses are glasses that can prevent blue light from irritating the eyes. Special anti-blue light glasses can effectively isolate ultraviolet rays and radiation and filter blue light, making them suitable for use when watching computers or TV.

Blue light is an important component of visible light. There is no separate white light in nature itself. Blue light is mixed with green light and red light to produce white light. Green light and red light have lower energy and cause less stimulation to the eyes. Blue light has a short wave and high energy. It can directly penetrate the lens and reach the macular area of ​​the eye, causing macular degeneration.

The wavelength of visible light in nature ranges from 770 to 390 nanometers. Different wavelengths cause different color perceptions in the human eye. For example, 600-700 nanometers are perceived as red, 500-600 nanometers are perceived as yellow, and 400-500 nanometers are perceived as blue.

In physics, the shorter the wavelength, the higher the energy and the stronger the penetrating power. For example, the harm of ultraviolet rays to the human eye is confirmed, but there is not much research in China on the harm of blue light to the human eye. There are many studies on this aspect abroad, especially in Germany. Relevant research results show that blue light has been confirmed to be the most harmful visible light. Blue light can stimulate an abnormal retinal in the retina, producing a large number of free radical ions. These free radical ions increase the damaging effect of retinal on the retinal pigment epithelium, thereby causing atrophy of the retinal pigment epithelium and then causing the death of photosensitive cells. The death of photosensitive cells will lead to a gradual decline in vision or even complete loss of vision.

Computers, mobile phones, bathroom heaters, projectors, laser pens, fluorescent lamps, LED flashlights, etc. all have a certain amount of blue light, which has a certain impact on vision. For example, if you stare at a mobile phone or computer for a long time, your eyes will feel dry, tired, sore, etc. However, it must be pointed out that blue light is only one of the factors that cause these problems. In addition, there are many other factors such as electromagnetic radiation, screen flickering, and long-term lack of rest for the eyes.