1. What is noise?
Noise refers to the sound that people don't like, feel uncomfortable or need after listening. Noise pollution is the most worrying trouble. As we all know, people who work in noisy environments often cause the problem of hard of hearing. Experiments show that persistent high-pitched sound can destroy the internal organs of mice and even kill them. So the same treble continues to stimulate the human body, and the consequences are believed to be known to everyone.
People who like to listen to music at the loudest volume, especially those with headphones, are prone to hearing loss. For example, people engaged in manufacturing, construction, mining and forestry are at higher risk of hearing loss.
2. The influence of noise on human body
An example of physical effect of noise level (decibel)
0-50 comfort whisper
50-90 Talk about sleep, sadness and anxiety.
90- 130 Rock music with itchy ears and painful ears
/kloc-more than 0/30 gunshot of eardrum rupture and deafness.
A: Decibel is a unit for measuring sound.
3. Harm of noise
1. Noise impairs vision.
As we all know, noise will seriously affect the hearing organs and even make people lose their hearing. However, there is a subtle internal "connection" between ears and eyes. When noise acts on the auditory organs, it will also "spread" the organs through the action of the nervous system, which will weaken people's vision.
It is pointed out that noise will reduce the sensitivity of human eyes to brightness. Some people have done experiments: when the noise intensity is 90 decibels, two-fifths of people's pupils dilate; When the noise reaches 1 15 dB, the adaptability of eyes to brightness decreases by 20%. Noise will also reduce the stability of visual clarity. For example, when the noise is 70 decibels, it takes 20 minutes for the visual clarity to return to a stable state, while when the noise is 85 decibels, it takes at least 1 hour.
In addition, noise can make eyes unable to respond to the symmetrical balance of moving objects. Scientific research has found that noise can stimulate and inhibit the nervous system. People who work in noisy environment for a long time can also cause neurasthenia (such as headache, dizziness, tinnitus, memory loss, vision loss, etc.). For example, in flight attendants, there are fewer people who are sensitive to the symmetrical balance of moving objects, and more people who are slow to respond.
Furthermore, noise can also make color vision and color vision abnormal. The survey found that among 80 workers exposed to steady noise, the red, green and white visual fields decreased by as much as 80%, which was 85% higher than that of the control group.
The influence of noise on eyesight is reflected everywhere in daily life, and most people have personal feelings. For example, when shopping in a quiet and bright store, you look happy and calm, and you can choose carefully and buy everything. However, when high-pitched loudspeakers loudly play fast-paced pop music (some so-called pop music is just deafening noise), shopping often becomes agitated, dazzling and even chaotic, and those who have bought it are not satisfied because they have not carefully identified them.
The main reason is that noise affects vision.
2. It has been proved that noise environment can lead to hypertension.
German scientists have recently confirmed that people who live in a noisy environment for a long time are prone to high blood pressure. However, related studies have not found a significant relationship between noise environment and hypertension.
The German Ministry of Environment conducted a survey of 1700 residents, and found that people with a noise level of 55 decibels during sleep had twice the risk of hypertension as ordinary people.