Hearing loss is the inability to hear partially or totally in one or both ears. When hearing threshold or the least hearing ability of a person is over 25 dB (deciBel), then it can be termed as hearing loss or impairment.
*World Health Organisation, National Sample Survey
A hearing aid amplifies sound for people with hearing impairment. The device varies in size,from larger ones that fit behind the ear, to tiny ones that fit inside the ear canal.
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