Chaps
Just thought I would update the situation as it currently stands in Australia as I have have several PM's lately requesting info. I had reason to speak with CASA Medical department today regarding another matter but I also asked for clarification on what testing is being conducted here at the moment.
First you do the Ishihara 24 plate version;
When you fail that you do the Farnsworth;
When you fail that you can do the Signal Light Gun test at your local airfield, and or
the practical lantern test conducted at the Victorian School of Optometry.
You can do all four tests if you need to, you only need to pass one to be cleared with an unrestricted class one medical. I passed the practical lantern test.
Cheers