Coming at this from a gamedev perspective - imo, if you can, the best solution is to never use colour alone to convey information. For example, you can have a blue and a red thing, but the blue one also has spots. Or it's a dark blue, and the red is light. Or the blue thing is a diamond and red thing is a circle, etc etc. This has the added benefit that it helps everyone, not just the colourblind.