I am Red /Green colour deficient. Always have major problems with the colour plate test. "Major" as in 8 out of 24 correct....
I have done the Farnsworth Lantern test a number of different times and always score better. The main issue I have with the plates, is that I can see a figure but always confuse a 6 with an 8 or a 3 with an 8 etc.
I had to do the Farnsworth test on my initial Class 2. They tested me again on the Colour plates at my last medical renewal. Even though I had an abysmal score, me medical was processed without any dramas.