Pure tone average hearing threshold PTA: 500Hz, 1000Hz, 2000Hz, 4000Hz four frequency points account for 70% of the importance of determining language intelligibility, is a key range to measure hearing function. To this end, the World Health Organization WHO uses the average of the hearing loss at the four frequency points of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz as the base is for dividing the hearing decline level.
In general, patients with hearing loss within 80 dB can choose a hearing aid with normal power. Patients with hearing loss within 80-90 dB can choose high-power hearing aids. Patients with hearing loss above 90 dB can choose super-high power hearing aids. The hearing aid power is too small, the hearing-impaired patients will feel the sound is too small, can not hear clearly, the power is too large to increase the price of the hearing aid.
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Link：How to choose the China hearing aid
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