The First CROS Hearing Aids?
In 1965, Harford and Barry were credited for the first accessible published description of across-head fitting1. It was called the CROS (Contralateral Routing of Offside Signals). Harford and Barry did acknowledge, however, that Wullstein and Wigand had published results on an almost identical across-head arrangement three years earlier2. The Wullstein and Wigand work has seldom…
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Ear Impression History – From Teeth to the Ear
Earmolds for hearing aids have been a staple for many years, made from impressions of the ear. Although considerable information exists about the earmold, the finished product, early ear impression history is murky. What we do know is that ear impressions took their lead from impressions of the teeth (dentistry), following somewhat later. The contribution…
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