If you are going for a Job reading numbers in a colour card book then those books are relevant.
I have a tiny problem with colour which has never restricted my medical until I had to wear specs for reading. My long distance still being excellent.
Not liking wearing specs I had them tinted to look like sun glasses. I could hardly read a thing.
The Docter insisted I use the glasses to read the book regardless of the tinting and made me have a lantern test which I passed 100% with clear glasses.
It is pretty obvious to anyone that the person with the best colour vision in the world is going to see green if he looks through yellow glasses at blue etc etc etc with other shades of colours
Maybe the use of sunglasses should be banned?
Just a warning to people who use glasses and have them tinted.