The Ishihara Color Blindness Test is a commonly used test to see if someone is colour blind. Most people are familiar with them, it's a common test done at eye doctors and at the DMV.
If you look at the image above you will see the number, "35" - as long as you have no colour differentiation issues. If you only see a, "3", "5", or no number at all then you are colour blind to some extent. A fun website Fake Science published a nifty image to share with a special colleague.
This lovely image was presented to a particularly blond nurse who stared intently at it before pronouncing, "I can't see any number." All of us get a a good giggle at this. The team are about to go looking for the next victim when the nurse proves her blond hair is natural.
"But, I'm not wearing my glasses."
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