Abstract
For the study of noise induced hearing loss due to vibration, 68 patients with vibration syndrome (white wax disease) were examined by the audiometry, Bekesy tracing, SISI test and impedance audiometry. They did not show C5 dip in audiogram but C4, C5, C6 down slope pattern, and their hearing loss reached to maximum level within the first 6 years of their works with vibrating machines. And it was revealed that their hearing loss progressed only at the same rate as physical change after their forth decade. Therefore, it seemed less likely that vibration causes their hearing worse after their retirement.Their hearing loss was severer than that of workers under chronic noise only, so it was believed that vibration makes noise induced hearing loss severer. And there were several differences between chain saw labours (22 ears) and coal miners (83 ears) on their audiograms, and the hearing loss of the former showed severer than that of the latter. We speculated that this was caused by the differences of their tools and their circumstances in temperature.
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