2 Clinics in Guwahati City. Lakhtokia & GS Road.
Hearing impairments are categorized by their type, their severity and the age of onset (before or after language is acquired). Furthermore, a hearing impairment may exist in only one ear (unilateral) or in both ears (bilateral). These main types of hearing impairments are discussed below:

Conductive hearing loss
A conductive hearing impairment is present when the sound is not reaching the inner ear, the cochlea. This can be due to external ear canal malformation, dysfunction of the eardrum or malfunction of the bones of the middle ear. The ear drum may show defects from small to total resulting in hearing loss of different degree.

Dysfunction of the three small bones (ossicles) of the middle ear may cause conductive hearing loss. The mobility of the ossicles may be impaired for different reasons and disruption of the ossicular chain due to trauma or infection may also cause hearing loss.

Sensori-Neural hearing loss
A sensorineural hearing loss is one caused by dysfunction of the inner ear, the cochlea, the nerve that transmits the impulses from the cochlea to the hearing centre in the brain or damage in the brain. The most common reason for sensorineural hearing impairment is damage to the hair cells in the cochlea.

Mixed hearing loss
Mixed hearing loss is a combination of the two types discussed above.

Before language (Pre lingual)

Prelingual deafness is hearing impairment that is sustained before the acquisition of language, which can occur due to a congenital condition (at birth) or through hearing loss in early infancy. Prelingual deafness impairs an individual's ability to acquire a spoken language. Digital Hearing Aids allow prelingually deaf children to acquire an oral language with remarkable success if speech training is performed within the first few years.

After language (Post lingual)
Post-lingual deafness is hearing impairment that is sustained after the acquisition of language, which can occur due to disease, trauma, or as a side-effect of a medicine. Typically, hearing loss is gradual and often detected by family and friends of affected individuals long before the patients themselves will acknowledge the disability. Digital Hearing Aids are the most common treatment.

Unilateral and Bilateral
People with unilateral hearing loss or single-sided deafness (SSD) have difficulty in:
• hearing conversation on their impaired side
• localizing sound
• understanding speech in the presence of background noise.
In quiet conditions, speech discrimination is approximately the same for normal hearing and those with unilateral deafness; however, in noisy environments speech discrimination varies individually and ranges from mild to severe.



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Col. J. Ali Road, Lakhtokia,
Guwahati, Assam
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