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An original computer-fitted diagnosis system for registration of noise-induced hearing loss (NIHL) is presented and compared with the tested persons' subjective hardness of hearing. Among 6 904 brewery workers it was found that people below 40 years only contract little NIHL during the first 5 years of noise exposure. The NIHL after more than 5 years of noise exposure is of the same magnitude as the hearing loss resulting from 10--20 years of age. The NIHL in older age groups was of a minor degree. Permanent use of hearing protectors was associated with good hearing, but the data suggest that good hearing might be the cause and not the effect of the use of hearing protection.

In 17 patients with operatively confirmed, mostly large acoustic neuromas, optokinetic nystagmus was analysed relative to the size of the tumour and its relation to the brain stem. In 6 patients op...

173 ears treated with grommets for secretory otitis media were followed-up in 1978 and again in 1985, i.e. 11 1/2—14 1/2 years after the initial treatment. The results show deterioration of hearing impairment, progression of tympanic membrane changes and increase in the number of ears with chronic suppuration following the last treatment with grommets; cholesteatoma, however, was not encountered