Thread copy from Cloudy Nights forum.
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>From the site:
FACT: 1 out of 255 women and 1 out of 12 men have some form of color vision deficiency.
Take the online color challenge, based on the official FM100 Hue Test by X-Rite.
0 is a perfect score and the highest is 1241, lower is better.
http://www.xrite.com/custom_page.aspx?PageID=77
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This is a hue acuity test to gauge your ability to see colour variations etc...
I took the test and scored 99... Judging by the average results on cloudy nights, this just confirms what I already knew, I'm colour blind.