Not good at all. I'm deaf in my right ear from a canal wall procedure when I was a teenager (chelestiatoma - I butchered that word btw) and have hearing loss in my left ear as well from scarlet fever when I was a kid. Ironically enough

it's mostly low-tone hearing loss too. I usually find the notes on my a-g string since I can hear the tones there a lot easier, and of course then it's no problem knowing where to play the same note on my E and B.