Human ear is capable of hearing sound from 0 dBhL (faintest sound perceivable by a normal adult) to about 140 dBhL (the noise of a jet engine within 250 yards). Hearing impairment can be from mild (cannot hear below 40 dBhL) to moderate (cannot hear below 60 dBhL) to moderately severe (cannot hear below 75 dBhL) to severe (cannot hear below 76 – 95 dBhL) to profound (cannot hear 95+ dBhL).
Hearing disability can be congenital (from birth) or acquired (e.g., through a loud work environment). This disability can be managed either through mechanical hearing aids or through surgical interventions.
A hearing disability is often looked upon as a social stigma and many people with mild to moderate hearing impairment fail to accept that they have a hearing problem. But many a times, acquired hearing disabilities, mostly those seen when a person is working in a highly noisy environment, can only get worse with time.
When hearing abilities of a person gets worse by the day, she starts experiencing problems with everyday life. Driving in the traffic can become dangerous as the person fails to hear sounds that may help in safe driving. Daily communications become difficult and the person starts experiencing frustration and other emotional problems. All these problems can be avoided if only timely intervention is made.