Interesting. As I understand it, shifting the red curve to shorter wavelengths, even by a seemingly small amount, would improve visibility. And something I've learned is that red vision varies by a fair amount from person to person.
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Is there vision tests similar to audio tests where they figure out one's individual responses to different wavelengths of light? Super neat.
It would be cool to simulate different people's vision, not just colour-blindness but the more subtle variations.