Audiology is the science concerned with hearing, balance, and conditions that can affect hearing and balance systems. This branch of medicine deals with the diagnosis and measurement of impaired hearing. Audiology has vast applications and is seen in action at schools, hospitals, industries and rehabilitation centers. In this specialty certain tests and observations are recorded like hearing tests, otoacoustic emission measurements to determine the degree of hearing impairment. These results also help to locate the site of damage. Together these results are helpful in the diagnosis and development of treatment and rehabilitation plan for the affected person. Depending upon the type of impairment hearing aids, cochlear implants or further referrals are suggested. Specialists who practice audiology, treat hearing loss and help to prevent further damage to hearing ability are called audiologists.