Remember that if you can pass any one of the Ishihara, Farnsworth or Tower signal light tests (or potentially now the CAD, which passes more people than the lantern tests), you meet the standard. It is only those who can't pass any of those that are considered to be "CVD pilots", which is a far lower number than the prevalence of abnormal colour vision in the population.
Not quite, but you’ll get there eventually, ausdoc.
It is correct to say that a person who passes any one of the tests mentioned in CASR 67.150(6) has demonstrated compliance with the colour perception standard. One of those tests is a test that simulates an operational situation.
The CAD test does not simulate an operational situation. Once the zealots on a medical crusade in Avmed are dragged into compliance with the law and determine tests for the purposes of CASR 67.150(6)(c) that do, in fact, simulate an operational situation, all of the pilots who’ve been unnecessarily stuffed around will be able to get on with their lives and careers.
As to the numbers of pilots with CVD, I have to say that I was appalled by the implications of Mr McCormick’s statement that there are “only” X of “them”.
What difference does the number make?
If CASA decided that pilots with black skin may, as a consequence of the colour of their skin, be a danger to the safety of air navigation, would the fact that there are “only” 3 or 30 or 300 of “them” make any difference to the validity of a medical crusade to save the world from potential dangers of pilots with black skin?
It’s appalling.
