Actually 2C residual hearing was previously lost to the harder tips on the electrodes damaging the nerves. However, with the newer CI's *at least I know mine has it* that they are preserving residual hearing with softer tips on the electrodes.
As CI technology progresses they may be able to even guarantee that residual hearing will be preserved. As for me, I wouldnt know if it worked or not, as I waited to implant till my hearing worsened to such a degree that I was not able to hear out of a HA.
One of the reasons why I chose my CI was that it is supposed to *help* preserve residual hearing.
