This subject goes deeper than it appears! flying is an occupation/profession unlike any where every year a pilot has to present himself/herself for a first class medical to continue with their livelihood /profession.
Just imagine a Lawyer / Doctor having to present themselves every year or six months and being told sorry mate your career is over.
i know some pilots who avoid going to the doctor with ailments for fear of it going on their records.
The aviation medical authorities because of this fact do try to accommodate pilots with issues and keep them flying where possible and where they consider flight safety is not compromised.
The great Sir Douglas Bader flew with no legs and was famous for his saying
" Rules are for fools to obey and wisemen to question". This was a guy who pushed the limits.
Another great saying? " If you do not push the limits you will never find what lies beyond" A saying which will attach to all human endeavour in all walks of life from medicine research to individuals challenging their own disabilities to achieve what they want in life.