My right ear got a bad infection years ago, resulting in a mild tinnitus.
Then I popped my right ear drum while hitchhiking through Newfoundland during the winter, bearing a beating from the cold and leaving a resulting dampening to my hearing and a louder pitched tinnitus.
Then I worked in a factory this year, causing horrible ringing that persisted even through my days off.
Now I would sacrifice my eyesight in exchange to return my hearing to when I was a young man.