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Like many men, I have a red/green defect.
In my latter year's of racing, I learned how to 'trick' the Ishihara Test (the pages of coloured dots) - knowing I had the defect, I looked behind the obvious answer and generally did OK.
In the early days, they used to have the RAC quack wave flags around at Belgrade Square.
The only time I have ever had an issue with colour vision was on the footplate of a train. On a particularly straight and level stretch of track outside York the block signalling could be seen numerous sections into the distance. The driver could see that the furthest signal was green - I could see the light but couldn't tell its colour. Not being able to identify a 24w bulb at about 5 miles has never really caused me a problem!
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