Hearing loss is a major global issue. Around 5% of the world population, 430 million, have disabling hearing loss. With ageing populations, this burden will only increase.
The primary remedy is the simple hearing aid. It is an essential helpmate to ensure continued social contact and quality of life. Simple, but not necessarily cheap. They cost around US$1,000 (£850) per ear for a reasonable quality device – not an insubstantial amount, especially in times of austerity. Although, in the UK they are free on the NHS.
The basic function of a hearing aid is to amplify sound in a pattern to match the profile of the loss of hearing sensitivity in the wearer. Legally, a hearing aid can only be dispensed by a registered clinician. But a new class of devices, called personal sound amplification products (PSAPs), bypass this legal restriction.
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