My sister, Bev, who has stage 3 Parkinson’s disease, has developed major hearing difficulties since her diagnosis in 2017. Bev has worn hearing aids to treat age-related hearing loss for several years, but they have become less effective, particularly with the onset of Parkinson’s, and Bev struggles to hear the television and both in-person and phone conversations.  Parkinson’s disease can affect the cochlea, which is a hollow bone in the inner ear that plays an…

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