if you had something that was structurally deficient in an aircraft it would be modified so that it wasn't structurally deficient.
the recent replacement of Tiger Moth tie rods is a perfect example.
the aircraft were fixed and can continue to fly.
in the case of a Colour vision deficit pilot they lack some of the 'rods' and 'cones' structures in the retina of their eyes. this is a genetic thing like being born with 6 toes on a foot.
in the worst case of the deficit the person can only see in shades of grey.
but they aren't blind. they can still see with the same high definition as a person with the full expected compliment of 'rods' and 'cones'.
they, unlike the nutters in CAsA, have no mental deficit.
we, the pilots of australia, should get behind our fellow pilots affected by this CAsA nonsense and legally hammer the CAsA fcukwits into the dirt.
this CAsA action is utter dribble.
