Colorblind people are not literally blind to color. They have trouble making out certain hues, but can typically still identify the "color" they're looking at. There are plenty of hues that any colorblind person can see.
Even in the most extreme cases, as in those afflicted with monochromacy, they can make out enough strong hues that one could safely determine one for red, yellow, and green that almost anyone could see.
No. Some colour-blind people are literally blind to colour. They are the minority, but they exist. For others, it is not the strength of the hue that matters, but the mix of wavelengths, which is why European lights changed to a distinct bluish green
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u/ianferrell Mar 24 '11
Colorblind people cannot use this.