By hearing devices, I assume you mean a bone anchored hearing aid. The titanium post gets screwed into your skull right behind your AN ear, vibrates your skull (you cannot feel it) and your good ear hears what words/sounds the BAHA hears. I have tried to think of a way that radiation on the AN side could have any impact on your good side. The ability to control those waves of energy is so very precise that it would totally suprise me that it could have any impact on your ability to hear sound from a BAHA or via air transmission. I'm sure the energy does not soften the skull and reduce the ability of the BAHA to vibrate your skull. Beats me!
Now, they may mean that if you are left with hearing in your AN ear following radiation, and it is rather poor, a hearing aid my not help as much. I'll bring this up and see if it holds any water... when I was wandering through the treatment options, 2 docs told me that the majority of radiation patients lose the hearing in their AN ear within 5 years of the treatment. Now this is not my statement...this is what I was told. This is one of the reasons I chose surgery.
My problem right now is my good ear is going bad regardless of the type of treatment I had. I was not first in line when they gave out ears...I was first in line for teeth.