(1) Conductive deafness -- deafness caused by the obstruction of the way of external sound into the ear (< 60dB)
(2) Sensorineural deafness -- deafness caused by pathological changes of inner ear hair cells or auditory nerve and auditory center (presbycusis)
(3) Mixed deafness -- both conductive deafness and sensorineural deafness
香蕉形图代表所有构成人类正常谈话的声音– 根据英文发音言语绘制
Listening diagram
Classification of hearing loss:
0-15db normal
15-25DB slight hearing loss
26-40dB mild hearing loss
41-55db moderate hearing loss
56-70db moderate to severe hearing loss
71-90db severe hearing loss
>90dB very severe hearing loss
As shown in the figure on the left:
Left ear (blue x): low frequency hearing is normal, gradually transition to high frequency severe hearing loss.
Right ear (red O): moderate to severe hearing impairment
Auditory effect:
Patient's left ear: can hear low to medium frequency sound, but can't hear high frequency sound.
Patient's right ear: no normal sound (low to high frequency) can be heard
Comprehensive hearing: the sound can be heard by the left ear, but it is difficult to hear in noisy environment.