Usually, according to the pure tone audiogram, the average threshold of binaural air conduction 0.5KHz, 1KHz, 2KHz, 4KHz are calculated respectively (for those with binaural hearing loss, the side with better hearing prevails), and the degree of hearing loss is classified according to the following criteria: Classification Hearing threshold average performance 0 (normal) ≤25dB No or very mild hearing problem, can hear whispering 1 (mild hearing loss) 26 -2 (moderate hearing loss) 41-70dB Hear and repeat normal speech at 1m 3 (severe hearing loss) 71-90dB Hear certain words when shouting 4 (profound hearing loss) >90dB Cannot hear and understand shouting For sensorineural deafness, hearing aids can be worn for hearing loss below severe level. For severe and profound hearing loss, cochlear implantation can be performed if hearing aids are not effective. Of course, there are strict indications for cochlear implant surgery, which need to be evaluated at an outpatient clinic.