2 Clinics in Guwahati City. Lakhtokia & GS Road.
Diagnosis & Management


The severity of a hearing impairment is ranked according to the additional intensity above a nominal threshold that a sound must be before being detected by an individual (it is measured in decibels of hearing loss, or dB HL). Hearing impairment may be ranked as mild, moderate, moderately-severe, severe or profound as defined below:

   for adults :between 26 and 40 dB HL
   for children :between 20 and 40 dB HL
Moderate: :between 41 and 55 dB HL
Moderately-Severe: between 56 and 70 dB HL
Severe: between 71 and 90 dB HL
Profound: 91 dB HL or greater
Totally Deaf: Have no hearing sensitivity at all.

Hearing sensitivity varies according to the frequency of sounds. To take this into account, hearing sensitivity is measured for a range of frequencies and plotted on an audiogram. (usually 250 Hz to 8 KHz).

There are a number of devices that can be used to improve hearing.

Hearing aids
Hearing aids, which amplify the incoming sound, will improve hearing ability, but nothing can restore normal hearing.

Cochlear Implants
Cochlear implants improve outcomes in people with hearing loss in either one or both ears. Cochlear implants artificially stimulate the cochlear nerve by providing an electric impulse substitution for the firing of hair cells.

Assistive Listening devices

Many hearing impaired individuals use assistive devices in their daily lives:
Individuals can communicate by telephone using telecommunications device for the deaf (TDD). Other names in common use are textphone and minicom.
Real-time text technologies, involving streaming text that is continuously transmitted as it is typed Instant messaging software.
Videophones and similar video technologies can be used for distance communication using sign language.
Phone captioning is a service in which a hearing person's speech is captioned by a third party, enabling a hearing impaired person to conduct a conversation with a hearing person over the phone.
Hearing dogs are a specific type of assistance dog specifically selected and trained to assist the deaf and hearing impaired by alerting their handler to important sounds, such as doorbells, smoke alarms, ringing telephones, or alarm clocks.
Other assistive devices include those that use flashing lights to signal events such as a ringing telephone, a doorbell, or a fire alarm.

Wireless devices

Three types of wireless devices exist along with hard-wired devices.
FM System
Audio Induction Loop and
Infra red system.

Each system has advantages and benefits for particular uses.

Children & Adults with:

Mild hearing loss (26-40 dB)
Have minor problems in pronunciation in some cases
Moderate hearing loss (41-55 dB)
Have problems in pronunciation in some cases

Can hear people talk within a relatively short distance but find it difficult to listen to a low voice, especially in a noisy environment

Moderately-Severe hearing loss (56-70 dB)
Can hear people talk only within a short distance if hearing aids are not available, and rely quite heavily on lip reading for communication
Have difficulties in listening to tapes and watching TV programmes without subtitles

Hindered in speech development to certain extent with poor pronunciation

Severe hearing loss (71-90 dB)
Can hear sounds within a short distance, e.g. drumbeats, honks, etc.
Rely on lip reading for communication even with hearing aids
Have enormous difficulties in listening to tapes and watching TV programmes without subtitles

Delayed in speech development, but clear pronunciation is possible with early speech training

Profound hearing loss (over 90 dB)
Usually find it very difficult to hear sounds and can sense the vibrations only. Rely on hearing aids with which a limited amount of sounds can be heard
Rely on lip reading even with hearing aids. Other visual cues such as gestures and body language are helpful for comprehension of conversational speech
Cannot hear tapes clearly
Have immense difficulty in speech learning and therefore training at an early stage is very important.


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