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Evaluation of prescriptive fitting.

¹School of Speech Pathology and Audiology, Kent State University, Ohio 44242.

Journal of the American Academy of Audiology

|September 1, 1992

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Custom analog hearing aid circuitry had a +/- 12 dB gain match to prescription. Despite this large tolerance, elderly adults with hearing loss still reported significant benefits from the fitting approach.

Area of Science:

Audiology
Hearing Aid Technology
Biomedical Engineering

Background:

Analog circuitry in custom all-in-the-ear hearing aids presents electroacoustic matching challenges.
Prescriptive amplification formulas aim to optimize hearing aid gain, but manufacturing tolerances can impede accuracy.

Purpose of the Study:

To determine the minimum tolerance for custom analog circuitry manufacturers matching hearing aids to a prescriptive formula.
To evaluate fitting success by comparing prescribed versus preferred gain and pre- to postfitting perceived benefits.

Main Methods:

Eight elderly adults with mild to moderate sensorineural hearing loss were enrolled.
Real ear measurements were conducted using a probe-tube microphone system.
Custom analog circuitry was built to match a prescriptive amplification formula, with tolerance analysis.

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Main Results:

The optimal scenario of custom building yielded a +/- 12 dB electroacoustic match to prescribed gain, limited by analog technology.
The minimum tolerance found, while less than prior studies, was deemed excessive due to formulaic gain variations.
Participants preferred less gain than prescribed, yet reported substantial benefits.

Conclusions:

Analog hearing aid technology has inherent limitations in achieving precise electroacoustic matches to prescriptive formulas.
Even with significant electroacoustic tolerance, custom-fitted analog hearing aids can provide considerable perceived benefits to users.
Further research into digital solutions or advanced analog designs may be needed to improve fitting accuracy.