2. Facebook is blue because its founder, Mark Zuckerberg, suffers from red-green colour blindness.
3. Some 99% of all colourblind people are not really colour blind but colour deficient; the term colour blindness is misleading.
4. Colour blindness is hereditary, and is passed from mother to son on the 23rd chromosome. However, it can also be caused by eye diseases, ageing or retina damage. If a woman is red-green colourblind, all her sons will also be colourblind.
5. A fatal railway accident in Sweden in 1875 that killed nine people was believed to have been caused by a colour blind rail operator who failed to properly read a signal. After the crash, a method to test colour vision was developed and applied to railway workers.
6. In Romania and Turkey it is illegal for colour blind people to hold a driver’s licence. This arose from a fear that colour blind drivers would be unable to read traffic signals.
7. In World War II, colour blind men were considered to have an advantage since their inability to see green helped them to see through camouflage. Today, the military will not allow people to serve if they are colour blind.
8. Dogs, cats and rabbits see mostly grey. Monkeys have strong colour vision while bees and butterflies have superior vision and can see colours humans are unable to see.
9. Some few people suffer from a rare form of colour blindness called unilateral dichromacy which means they have one normal seeing eye, and one colour blind eye.
10. People who suffer from red green colour blindness have a difficult time determining if their meat is cooked enough. Without being able to see different shades of red, it is hard to tell.
(PS John Dalton wrote the first known scientific paper regarding colour blindness. He himself was colour blind.
PPS I had a friend in school who wanted to work in air traffic control but then they found he was colourblind, He became a civil servant.).
(PS John Dalton wrote the first known scientific paper regarding colour blindness. He himself was colour blind.
PPS I had a friend in school who wanted to work in air traffic control but then they found he was colourblind, He became a civil servant.).
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