Hearing Loss, Hearing Impairment

The three primary types of hearing impairment are: conductive, sensorineural, or mixed. When hearing loss is caused by a physical problem in the external ear or in the middle ear, it is referred to as a conductive hearing loss. Sensorineural hearing loss occurs when a sound is conducted normally from the exterior ear through the eardrum to the middle ear, but the inner ear does not transmit the sound normally to the brain. When the middle ear and the inner ear are involved, the hearing loss is referred to as a mixed hearing loss. Hearing loss is also classified according to degree of severity -- mild, moderate, severe, or profound -- and according to whether the hearing loss affect slow, high, or all frequencies of sound.

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