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Hi Kathy,
Thanks for your post regarding hearing and CD. This connection doesn't seem
to be well known. I experienced significant improvement in my hearing
during the first 6 months after diagnosis, but it has stabilized with a
small hearing deficit. (About 25% loss in some conversational frequencies)
Before diagnosis, my hearing was a real problem. I was learning sign
language. At that time, the specialist told me that I was suffering from
irreversible, progressive nerve damage.

Here is a citation to the only article  I'm aware of that speaks directly
to a connection between hearing and cd:

Contestabile M.T. et al., Atypical retinitis pigmentosa: a report of three
cases. Ann Opthalmol. 1992 Sept; 24(9):325-34

best wishes,
Ron Hoggan
Calgary, Ab.