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How We Hear. Sound waves are collected by the outer ear and channeled to the
ear drum. When sound hits the ear drum, it creates vibrations which in turn,
move three small bones in the middle ear. The smallest of these bones, the
stirrup, fits into the oval window between the middle and inner ear. When the
oval window vibrates, fluid in the inner ear transmits the vibrations into a
snail-shaped structure called the cochlea. In the inner ear, thousands of
microscopic hair cells are bent by the wavelike action of fluid inside the
cochlea. The bending of these hairs sets off nerve impulses which are then
passed through the auditory nerve to the hearing center of the brain.
Causes of Hearing Impairment.
Hearing can be affected by: middle ear infection, loud or constant
noise, heredity, illness, birth defects, traumatic injury, ototoxic medications,
tumors, arthritis, reduced blood flow, ear wax blockage, sinus, allergies or
just the natural aging process. Most children should be treated by an Ear Nose
and Throat Physician, while most older adults over age 50 simply need proper
amplification.
Symptoms of a Hearing Loss. Often, among the first sounds which "disappear" are
those in the higher frequency ranges which include women's and
children's voices and bird's singing. Difficulty hearing in public
gatherings like halls, theaters, churches and large rooms. Difficulty
with television, telephone voices or conversations within a group of
people. Adults avoiding group meetings, social occasions or family
gatherings where listening may be difficult or where one may feel
embarrassed about misunderstanding what is being said. Individuals
affected by hearing impairment often develop methods for coping with
difficult situations. These actions may include asking others to repeat,
turning their head to one side while listening to sounds or speakers,
turning up volume levels on the TV or stereo, avoiding social
gatherings, misinterpreting a person's spoken word or sentence.
Testing for Hearing Loss. Testing is painless, comfortable and safe. It consists
of answering questions about your hearing, recognizing everyday words at
different volume levels and identifying different sounds. Your ability
to hear each sound or word, produces a unique hearing pattern which is
recorded on an audiogram that indicates the type and severity of the
loss. These tests can indicate if medical intervention is recommended or
if a hearing instrument would be the best course of action.
Help for
the Hearing Impaired. Recognizing symptoms in yourself or
someone you know is the first step toward improving the situation.
Approximately 10% of all adult hearing losses may now be helped
medically. However, almost 90% may now be helped with today's various
technological advances available in programmable, digital hearing
instruments.
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