What are the classifications of deafness?

The classification methods of deafness are: 1. According to the onset time, it can be divided into congenital deafness and acquired deafness. Congenital children are likely to be born deaf, or have large vestibular aqueduct syndrome, and children will be deaf at the age of five or six. 2. According to the time classification, it can be divided into pre-lingual deafness and post-lingual deafness. That is, whether the patient's deafness is before learning to speak or after learning to speak. 3. According to the causes, it can be divided into conductive deafness, receptive deafness and neurological deafness. Conductive deafness is caused by the damage of the sound transmission structure of the ear, including the tympanic membrane and ossicles, resulting in imperfect sound transmission, including perforation of the tympanic membrane or otitis media. Neurogenic deafness accounts for 70% of deafness, because the sensing function of inner ear hair cells has decreased, which is called sensorineural deafness. There is something wrong with the auditory nerve or auditory pathway, which is called nervous deafness.