Hearing loss, also known as hearing impairment, is a medical condition in which a person becomes partially or totally unable to hear sounds. It can occur in both or one ear of a person and can be temporary or permanent. Normal hearing ability of a person ranges from 0 dB to 20 dB in all frequencies but when a person is suffering from hearing loss, the range of hearing varies from 16 dB to more than 90 dB. Complete report on Hearing Aid market spread across 74 pages with providing 4 company profiles, 2 tables and 43 charts is now available at http://www.marketreportsonline.com/654607.html.