Eric W.H. Taft wrote:
(I have a brother who was born deaf in one ear and mostly deaf in the other. Some surgery helped bring him up to speed, but he still has very, very poor hearing in one ear.)
I haven't looked into it for years, but it was my understanding that while I was
in the womb, I came down with German measles. This, apparently, stunted the
development of the nerve endings in my left ear. Apparently I have all the working
parts in the ear; it's just not "hooked up."
(This is all based upon my childhood understand, and what I learned afterwards.)
There was some talk at the time that I probably could have nerves removed from
elsewhere (my legs, for instance), and have them grafted into my ear. It was
fairly expensive to do so. Might be cheaper and better now. I've learned to live
without. It might screw me up now if I suddenly started hearing in that ear after
not having done so for 45 years.
Still. I've always considered it an option for if I lost hearing in the right ear.