When I was at LATCC,a colleague became quite profoundly deaf,but his hearing was restored to normal by taking steroids,however taking this drug precluded the issue of a class 1 medical,so he was caught in a kind of catch 22.
In my own case,I was referred to a specialist by the CAA ,who prescribed medication to control a (not hearing related) condition.After about 16 years taking this drug,declaring it at each medical,I saw a new doctor at my medical down at Gatwick,who said I could't have a class 1 while taking this.Summoned back a week or so later to see the Chief Medical Officer,he over-rode this & gave me my class 1.Following year,exactly the same thing happened again.Guess what I'm trying to say,is that,in my experience,it all seems to be very subjective,and it all depends on who is doing the examination on the day.