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There are two questions which the prospective purchaser of a hearing aid wants answered. The first is "What type of instrument and what particular make of instrument will give me most nearly normal hearing?" This question settled, the second one is "Does the particular instrument which best meets my hearing needs have serious defects of a practical nature that would make its purchase inadvisable?"
The answer to the first question involves two factors: (a) the specific hearing defects which the hearing aid is designed to remedy and (b) the adaptability of the instrument to the correction of these defects. In the comparable case of defective vision the procedure is obvious. The patient first goes to a competent ophthalmologist, who employs established methods of measurement to determine the source and nature of the difficulty. He can then prescribe the curvature of the lenses that will give the needed correction. This prescription
SABINE PE. ACCEPTANCE TESTS OF Hearing AIDS. JAMA. 1940;115(19):1633–1634. doi:10.1001/jama.1940.72810450007013
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