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It has been predicted by an official of one of the larger hearing-aid companies that in the near future all hearing aids, together with power supply and microphone, will be worn entirely on the head in some form or another. Even at this time hearing aids completely incorporated in a spectacle frame are being perfected. A receiver for each ear greatly improves auditory perspective, and it is the head-borne instrument which can provide two receivers most effectively. The recent use of the transistor, printed circuit, and crystal detector has made it possible to build hearing aids of such efficiency and small size that a complete instrument can all but be worn in the auditory meatus itself.
Most hearing aids in use today require heavy batteries and a microphone, which must be worn under clothing. Long wires and tubes cause loss in power and extraneous noise. Protruding buttons and wires are
McDONALD CF, BACH EC. AURICULOSTOMY. AMA Arch Otolaryngol. 1955;61(5):597–598. doi:https://doi.org/10.1001/archotol.1955.00720020614013
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