Killion, Mead C. Etymotic Research, Elk Grove Village, Illinois.
Villchur, Edgar Foundation for Hearing Aid Research, Woodstock, New York.
- Types of hearing loss
- User satisfaction
- Binaural hearing aids
- Links to Primary Literature
- Additional Readings
A device that amplifies sound for someone with a hearing loss. A typical aid consists of a microphone, an electronic amplifier, an earphone (called a receiver), and a battery. The sound is coupled to the ear with an earmold. The great majority of earmolds are cast from impressions of the individual patient's ear canal, but over-the-counter and mail-order hearing aids use prefabricated earmolds, commonly offered in several sizes. In the case of in-the-ear hearing aids, all components are small enough to be contained in an earmold shell that fits within the ear canal and concha, or even within the canal alone (Fig. 1). See also: Amplifier; Ear (vertebrate); Earphones; Microphone
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