And just in case anyone needs reminding of what the CAD (Colour Assessment & Diagnosis) test looks like, here it is:
Yep - this is what the AvMed zealots are currently using to satisfy CASR 67.150 (6)(c) - a test which is required under the law to simulate an operational situation.
Even the inventor of the test, Professor John Barbur, who gave evidence during my AAT appeal refuted this proposition:
“…Like in every study there are sort of strengths and weaknesses. The CAD system is mainly wasn’t designed specifically for aviation. It was designed for assessing colour vision, for detecting deficiency, both congenital as well as acquired, for quantifying the severity of colour vision loss, and for classifying accurately the class of colour deficiency involved. So from that point of view the CAD test, which is based on findings from camouflage studies some 25 years ago is an extremely good colour vision test and that’s as far as we go.”
“Yes, I mean the CAD test was not intended in any way to use direct information on operational tasks. What the CAD test does is to measure the colour signal strength. One needs to see red/green and yellow/blue colours and it does so very efficiently. If one doesn’t have colour vision one simply cannot carry out a test…”
“So that’s what the CAD test is. Just because it happens to predict a level of severity beyond which one cannot be considered safe within a particular environment. That does not make the CAD an operational test.”
