It's much easier to say I suffer from Daltonism instead of saying "I'm sorry, I'm colour blind". With the latter, almost immediately one is subject to a barrage of test questions, Starting off with "what colour is this?". At least when you say Daltonism you receive some form of pity; because they usually don't know what the malady is. Mention that one has colour blindess and the questions start flying.
The Ishihara test, although not completly accurate, is a good indicator of the degree of colour deficiency. However, many times you won't believed when you say that all you see is a bunch of dots.
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