4hw.com.cn: now many mobile phone manufacturers have launched the "eye protection mode" function for mobile phones, but some netizens may ask, is the eye protection mode really good for the eyes? The eye protection mode of mobile phone does have a certain effect, which can reduce the emission of blue light. However, for fatigue, the effect of eye protection mode is relatively small, so attention should be paid to eye use.
1. What is Blu ray?
Blue light, which can be understood as blue light in visible light.
The harmful light blue light that we say everyday, we can see, it is one of the seven color lights that make up white light. It is generally believed that the visible light band is 380nm-760nm (there are also data of 400nm-760nm, which is only a general range, and the spectrum band that everyone can see is different, there will be some differences). The light before 380nm is ultraviolet, invisible; the light after 760nm is infrared, invisible.
The band range of blue light is about 400nm-500nm.
2. What is' high energy blue light '?
We all know that ultraviolet can cause cancer, because it has a high energy to destroy human cells. Blue light and ultraviolet light are adjacent, and the energy is the highest in the whole visible light, so they also have a certain role in breaking pictures.
Why to mention the protection of blue light more now is closely related to the popularization of electronic products.
Today's electronic screens are mostly LED technology, led uses' red, green and blue 'light as the basic color, with three light groups to synthesize the rich colors we see. Red, green and blue can be combined into white light. If we filter or reduce the blue light, we can see from the picture that our vision will be yellow.
This is a schematic diagram of the luminous intensity of the electronic screen. It can be seen that there is the highest peak between 400-500nm in the blue light band. Because of its luminescent principle, the blue light content of electronic screen is very high, and the peak value is about 440nm. Such high-energy blue light is very harmful to human eyes. Therefore, it is generally believed that the band of high-energy blue light is between 415-455nm, which needs to be protected
3. Hazards of blue light to eyes:
Often see and say: 'high energy blue light, strong penetration, great damage to human eyes'. Why is blue light strong penetration?
Blue light is visible light, which means that blue light can reach the retina directly, and our light sensitive cells can feel blue light stimulation. The UV line is generally invisible because the structure in front of us has blocked and absorbed the UV light. There are two bands of ultraviolet rays, UVB (315-280nm) is blocked and absorbed by cornea, and UVA (400-315nm) is absorbed by lens.
PS: so the high altitude area has strong ultraviolet rays, and the incidence of keratopathy and cataract is high. The elderly are advised to wear good ultraviolet proof lenses.
Because of the high amount of blue light in the electronic screen, and we see that the electronic screen is used for a long time and a short distance, a large number of blue light will cause great damage to the eyes after reaching the fundus. When blue light irradiates the retina, it will produce free radicals, which will lead to the decay of retinal pigment epithelial cells. The decay of epithelial cells will lead to the lack of nutrients in light sensitive cells, which will cause vision damage. Blue light can also stimulate nerves, making us sleepy, which is one of the factors that cause insomnia, but insomnia is more related to personal state and mental stress.
Evaluation of eye protection model
The eye protection mode can reduce the amount of blue light and reduce the discomfort and fatigue of the eyes, but the degree is limited. After high-intensity eye use, there will still be a large degree of fatigue. Personal experience, when the human body is sleepy, the body is to rest. If you want to use your eyes excessively, you will be obviously tired and dry. In the daytime, high-intensity eye use does not lead to serious fatigue. Therefore, the eye protection mode is auxiliary, and the most important thing is to use the eye properly.