Abstract
Noise induced hearing loss (NIHL) is a problem that affects many people throughout the world. According to the World Health Organization (WHO), exposure to excessive noise is the major avoidable cause of permanent hearing loss worldwide. In the United States, NIHL is one of most common occupational related diseases. It is estimated that 16.1% of adults or about 29 million Americans have some type of hearing loss within the speech frequency range. This number seems to be on the rise since about 30 million Americans are currently exposed to noise every day in their jobs. Hearing loss has been shown to lower the quality of life, impair social interactions, cause isolation, and can cause loss of cognitive function
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