> Red and green look quite different to me! However, I cannot for the life of me spot my dog’s red frisbee in green grass, or pick out a red character among a bunch of green ones without looking at each character.
This is basically a textbook description of standard red green colorblindness. Whenever you find yourself doubting whether you actually are red/green colorblind, just go strawberry picking with friends.
Yep. Whenever I say I am colourblind, people show me a tree and ask "what color is it?". And I have to explain that I know what red/green is.
An example I give is red flowers in green grass: I may not see the flowers at all unless I go very close.
Another one is while climbing indoors: say there is a purple route next to a blue one. Some handles I will clearly classify as blue, some clearly as purple, and some in the middle I won't be able to classify. But non-colourblind people will clearly be able to classify them all.
> Whenever you find yourself doubting whether you actually are red/green colorblind, just go strawberry picking with friends.
I'm extremely bad at picking fruit in our garden. I'll go to pick the raspberries, strawberries, or peppers and only find a few. Then my wife will go out and find several times my haul from the same plants.