colors will never appear correctly to someone with color deficiency. The information is lost, not translated. The best you can hope to do (short of altering ey

colors will never appear correctly to someone with color deficiency. The information is lost, not translated. The best you can hope to do (short of altering eyeballs) is to make sure colors are differentiated in the perception of a color deficient person. Beyond just seeing a difference side by side, in many cases such as charts, one needs to be able to look at a color splotch at one part of a chart and be able to recognize it in another. This is harder than side by side diffentiation. For many colors that are as different as black and white to normally sighted persons, those same colors might as well be very slightly different shades of the same color. So in a grayscale chart with overlapping lines, it’s hard for anyone to distinguish small differences in shades, so people used unique symbols to differentiate them. That’s still the most reliable way to help colorblind people. Don’t solely rely on color. Augment with patterns and symbols when you can.