There are many different degrees of hearing loss, along with several different types of hearing loss. These include conductive hearing loss, Sensorineural hearing loss, and mixed hearing loss.
Conductive Hearing Loss occurs when there is a problem conducting sound waves anywhere along the route to through the outer ear or middle ear.
Sensorineural Hearing Loss is a type of hearing loss or deafness where the cause of the hearing loss lies within the inner ear. This type of hearing loss is typically permanent which can be mild, moderate, severe, profound or total.
Mixed Hearing Loss is a combination of both conductive and sensoruneural where there is damage to both the outer or middle ear and the inner ear.
Degrees of hearing loss
- Mild – difficulties keeping up with conversation, most difficult in noisy situations. Typically can hear quite sounds between 25 and 40 dB HL.
- Moderate – difficulty keeping up with conversations when not using a hearing aid. Typically can hear quite sounds between 40 and 70 dB HL.
- Severe – this person uses a powerful hearing aid and often relies on lip reading even while using them.
- . Typically can hear quite sounds between 70 and 95 dB HL.
- Profound – this person is very hard of hearing and relies on lip reading and/or sign language. Typically can hear quite sounds at 95 dB HL or more.
Causes of hearing loss
The causes of hearing loss can vary greatly – some are permanent, while others may be treated.
- Congenital Conditions
- Noise induced hearing loss
- Ototoxic drugs and chemicals