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A great deal of careful investigation into the use of hearing aids is represented here. Improvements in the field of broadcasting have been carried over into the field of otology, so that by means of sound-amplifing apparatus many of the deafened have been aided. The authors tested their deaf subjects in a number of ways and arrived at several interesting conclusions. By testing patients by a series of pure tones obtained from an audiometer, they found that a reliable index of the intelligibility of speech to the deaf could be obtained. They satisfied themselves that hearing aids are not, as many deafened persons believe, harmful to the user and do not cause further deterioration of the hearing. They emphasize the necessity of standardizing tests for the intelligibility of amplified speech and suggest that this is best done by means of an amplifier system properly constructed. They admit that impairment of
The Use of Hearing Aids. JAMA. 1937;109(7):529. doi:10.1001/jama.1937.02780330057027
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