Creampuff, as I stated in my original post I am not prepared to go to the expense involved in meeting CASA's demands, so in my case they are the final arbiter. First hand knowledge of the run around a couple of friends of similar age to me have had, and the infrequent flying I normally do, I will just stay grounded.
And that's one of the bad consequences of the current system. Someone of your experience should not be stuffed around at the whim of people who think they know better than your GP or specialist.
Yes: Pilots have to meet the standard. But CASA is not the fount of aeromedical wisdom. The colour vision crusade demonstrates to me that they are untroubled by minor hindrances like 'facts'.