Presbycusis has been likened to presbyopia, the two conditions having the aging factor in common. In the older population, the age of the person may be ascertained precisely from the amplitude of his accommodation. The aging process of the lens—increase in lipoid content and hardening of nucleus—is physiologic, with an incidence of 100% in humans. In the ear, the hypothesis that there is a decrease with age in the perception of the upper tonal range has been formulated from studies with the Galton whistle, by Zwaardemaker1; with the monochord, by Struycken2; with the audiometer, by Bunch and Raiford3 and Montgomery.4 Other etiologic factors of high-tone deafness include acoustic trauma, infections, and ototoxic drugs. In the differential diagnosis, the universality of the deficiency in perception of the high frequencies in the older age groups is stressed. None of the 60-year old persons in the Bunch and Raiford
SALTZMAN M. Presbycusis. AMA Arch Otolaryngol. 1957;66(1):67–69. doi:10.1001/archotol.1957.03830250071008
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