I looked up colour blindness in Kumar and Clark's reference 'clinical medicine'
it is the reference all the interns carry around.
"Ethambutol can cause a dose related optic retrobulbar neuritis that presents with colour blindness for green....."
that is it. the entire colour blindness reference in a 1400 page reference manual.
I can see these CAsA nutters declaring that green colour blind pilots are prohibited from landing on grass runways ....because they can't see the grass.
The CAsA people all need a stretch in prison for false pretences. seriously.