Is that true? I thought hearing loss is caused by damage to the hair cells in the inner ear, which I'd think can still be provoked by bone hearing headphones if they are turned up very loud.
I wrote about this exact thing in a review of the AfterShokz headphones on my blog. But here's the general idea...
The wording of the AfterShokz marketing material is very clever (from this page). They say:
So their wording claims that earbuds promote hearing loss AND damage to the eardrum. The second thing they say is that AfterShokz reduces the risk of eardrum damage. Nowhere do they claim that it reduces the risk of hearing damage!
This web page by the National Institues of Health, has this to say about noise-induced hearing loss:
Nowhere on that page does it say anything about eardrums or any connection between eardrum damage and hearing loss.
The conclusions that I take from this are:
From a letter to the editors of Hearing Journal:
Hearing Journal: June 2012 - Volume 65 - Issue 6 - p 4 doi: 10.1097/01.HJ.0000415192.03538.d6 Departments: Letters to the Editor
"Letters: The Truth about Bone-Conduction Earphones" Portnuff, Cory AuD, PhD; Berger, Elliott MS