How is hearing loss calculated, and what are the criteria for specific levels?
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It is natural hearing loss caused by age. Many elderly people will have some hearing loss. This is the result of the automatic decline of body functions as people age. Prolonged exposure to high-frequency noise. For example, working in a high-frequency noise environment, such as playing loud sounds for a long time and listening to music with headphones for a long time, or causing deafness due to some drugs, can also lead to hearing loss from the beginning.
How is hearing loss calculated, and what are the criteria for specific levels?
1. Normal hearing
Normal people’s hearing is generally between -10 and 25 decibels. All hearing functions were normal.
2. Mild hearing loss
The hearing of patients with mild hearing loss is between 26 and 40 decibels. Patients with mild hearing loss can generally perform In normal conversation and communication, the patient only feels a slight hearing loss. Communication in a quiet environment is not a problem. However, communication in a noisy environment will cause difficulty in hearing. At this time, it is necessary to Only with the help of Hearing Aids can you hear the other person's speech clearly.
3. Moderate hearing loss
The hearing of patients with moderate hearing loss is between 41 and 55 decibels. Patients with moderate hearing loss can already feel that their hearing has declined. I am obviously less sensitive to sounds than before. When talking to others, I need the other person to repeat themselves or increase their volume before I can continue to communicate with them. In many situations, you need to wear a hearing aid to hear the other party's speech clearly, including in a quiet one-on-one environment.
4. Moderate to severe hearing loss
The hearing of patients with moderate to severe hearing loss is between 56 and 70 decibels. Patients with moderate to severe hearing loss have obvious hearing loss. When communicating with the other party, the other party needs to raise a relatively loud voice to be heard. At this time, normal communication can only be carried out by wearing a hearing aid.
5. Severe hearing loss
The hearing of patients with severe hearing loss is between 71 and 90 decibels. Patients with severe hearing loss need to shout loudly when communicating with others, and they must pay attention to the changes in the other person's mouth shape to understand the other person's meaning. Patients with severe hearing loss can only rely on hearing aids to carry out normal communication activities no matter what the occasion. In addition, long-term inability to hear speech will lead to slurred speech.
6. Profound hearing loss
The hearing of patients with profound hearing loss is greater than 90 decibels. Patients with severe hearing loss will not only have severe hearing impairment when communicating, but their speech will also become blurred. The effect of wearing a hearing aid at this time depends on the frequency and degree of the patient's residual hearing. Since patients have very poor speech recognition abilities, in addition to relying on hearing aids, they must also rely on their visual observation and even touch to perceive sounds.
Human ears cannot hear all sounds in the universe. They have a certain range, with an average of 20-20,000 Hz. People's hearing is mainly used to listen to language, and the frequency of language is not wide. Its main range is 500-3000 Hz. Therefore, scientists call the three representative frequencies of 500 Hz, 1000 Hz, and 2000 Hz speech frequencies. The calculation of hearing is to add the decibels obtained from these three audio tests and divide them by 3. The average obtained is the hearing level of the human ear.
The currently used electronic audiometer can test the nature and degree of deafness. People with normal hearing will not find it difficult to listen to speech in daily life and work. If they can hear an average conversation at a distance of 6 meters, the hearing level is within 10 decibels.