I'm no expert but I've been told,not by an expert,that it's a no no with a PPL as PIC.The same person said that it's OK in the professional flying world as long as the other chap/chapess doesn't have one.Perhaps it depends on the type of condition being corrected.There are thousands I believe.
I believe train drivers are OK to be in charge,of a train of course.
Have you asked the CAA?If they are still called that.Their doctors should know.
I doubt if the aircraft kit will affect your device but you are not supposed to go near radar.Airport ground staff go ape if you try to go through the detectors with one.Doctors reckon it won't do you or your device any harm.It might make a lot of noise in the security areas though.
Good luck