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10.6.12 Noise induced or sensori-neural hearing loss
This form of hearing loss is produced gradually from long term exposure to noise. Over its years of development, the condition begins by affecting high frequencies (usually at the 4000 Hz level) and eventually those at the lower levels.
Employees suffering from industrial deafness will have reasonably normal low frequency hearing, but distorted high frequency hearing. The volume of speech is unaffected, yet the clarity of speech, determined by consonants, lessens.