After how many flight physicals beginning in 1964...FAA, US Army, UK CAA, Iran, Nigerian, company, and US Navy......to be told in 1998 that I was colour blind was a bit of a surprise. I reminded the FAA Quack that made the statement....that I certainly was for I invariably received maximum marks under the "Equal Opportunity" catagory on my personnel reports yearly.....he did not see that bit of humor.
After much palavver....he insisted the truth of the matter was that despite my being able to identify by "color" every color on the signs, posters, and photographs on display.....I was not seeing the actual color and thus was "color blind".
Upon my employer suggesting my malady being quite temporary....all of our medical exams would be moved to a competitor.....I had an amazing, nay, an evangelical style healing of the problem.
Evidently, the Quack had a red-green defiecency onset.....with the moving of our business to the competitor.....our quack's practice would soon see red.