Industrial deafness is a progrssive deafness due to persistent loud condition, and its hearingloss reveals in begining to decrease at vicinity of 4, 000 cycles. And the most harmful sound components causing the affection range 2, 000 to 4, 000 cycles.
Because of these and to have no effective treatment for this troublesome tinitus and deafness the prevention should be intended to sanitary inspection and sound protection from loud noise especially ranges 2, 000 to 4.000 cycles. The use of ONCHI's ear plugs, the auther promotes, may be valuable effect in protection of industrial deafness.
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