耳聋是听觉系统障碍所致的听力减低。轻者为重听,重者为耳聋。因两者之间无明显分界故概称为聋。根据发病的时间分为先天性聋和后天性聋;根据病变部位可分传音性聋、感音神经性聋和混合性聋;根据病变性质可分器质性聋和功能性聋。一、先天性聋出生后即有听力障碍者称为先天性聋。分传音性聋和感音神经性聋,前者因外耳及中耳病变所引起;后者因耳蜗、听神经和听中枢病变所 Deafness is hearing loss caused by hearing system disorders. Light for heavy listening, severe deafness. Because there is no clear distinction between the two so called deaf. According to the time of onset is divided into congenital deafness and acquired deafness; According to the lesion can be divided into acoustic deafness, sensorineural hearing loss and mixed deafness; According to the nature of the disease can be divided into organic deafness and functional deafness. First, congenital deaf that is hearing-impaired after birth is called congenital deafness. Sub-acoustic deafness and sensorineural deafness, the former due to the outer ear and middle ear lesions caused by the latter due to the cochlear, auditory nerve and central lesion