L ’ tonal audiometric allows decrease of hearing by quantifying ’ l ’ objectify extent of hearing loss and which frequencies being affected. And’ can also study separately the functionality of the auditory nerve and sound transmission system (outer ear, tympanic membrane, auditory ossicles and the middle ear).
And’ a simple exam ’, non-invasive and short-lived.
The patient is placed in a quiet or soundproofed and are placed headphones through which are heard of pure tones (sounds with a specific frequency) a ’ intensity note. The patient is asked to report when it is able to hear sound. Is then marked on a path the minimum intensity at which the subject is able to hear the sounds, distinguishing the individual frequencies and two ears.
You can then repeat the ’ examination with special bone conduction headphones that generate a sound putting directly into vibration (is absolutely painless and often indifferent to the patient from a normal headphone) the bones of the skull. ’ inner ear is stimulated directly regardless of the outer and middle ear ’.
With the traditional headset you have a precise idea of the capabilities of global hearing (threshold by air), While with the headset to vibrate the neurosensory system features bone (bone threshold).
L ’ examination may take even in children 3-4 years as long as cooperating.
