Abstract
By hearing impairment we mean a state wherein hearing is deficient. It is only when impairment is significant that it can be called deafness, which is a definite handicap for the individual having it. In this context two clear issues are implied, namely the clarity of sound and the acuity of hearing. Sometimes the sounds are distorted and one can not discriminate them from one another. As a result, intelligible speech is not understood. On the issue of acuity of hearing, World Health Organization has put forward four distinct levels. Any threshold up to 20db is normal. From 21–40db, it is mild deafness. Beyond 40db and up to 60db, it is moderate hearing loss. Thresholds above 60db and up to 80db are categorized as severe deafness. Levels above 80db merge into what is commonly called the profound or total Hearing Loss.
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© 2004 Springer-Verlag Tokyo
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Jalisi, M., Jalisi, S. (2004). Hearing Impairment and The Need for Voluntary Social Basis in Hearing Deficit Prevention Campaigns. In: Suzuki, JI., Kobayashi, T., Koga, K. (eds) Hearing Impairment. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68397-1_114
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DOI: https://doi.org/10.1007/978-4-431-68397-1_114
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-22326-9
Online ISBN: 978-4-431-68397-1
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