A friend recently got a job with a corperate
outfit with reduced hearing to one ear.
The only problem was satisfying the loss of license medical requirements- not of the job itself.
He had to pay for an MRI scan himself to establish that nothing unwanted was growing in his head and causing the hearing loss or thet the nerve ends were knacked !
He had audio test at CAA and they said it was below class one but deemed that it was not sufficient to prevent issue of the medical !
If his hearing had been much worse he would have to take a 'reality' test with appropriate background noise and a variety of messages over the headset.The CAA said they are very reluctant to pull a medical and thereby end your career/livelihood over this.
Hope this helps.