I always fail the test when they put those cards up with dots on. I failed a mechanical job working on the maintenance of diesel electric locomotives, I asked them if they had coloured nuts and bolts. I have done technical and electrical work all of my life without a problem, colour blind is an incorrect term, I am colour deficient, I cannot see pale pinks and greens, I can see cable colours and traffic lights as far away as anyone else etc.
There is a high percentage of people with colour deficiency, and employers seem to go over the top with this.
I almost failed a job as an engineer on a ship, the medical failed me from those charts with dots but the personnel manager held 3 coloured pens up and asked me the colours which I had no problem with.