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A family member has red-green colour blindness and this prompted me to go and look up those glasses. Disappointingly, it turns out they don't actually correct the perception of colour, they just filter out some of the wavelengths that confuse the impaired receptors and help the wearer see a bigger contrast between red and green. They also aren't suitable for nighttime or driving, and can be expensive. Could still be pretty useful if the inability to distinguish between the two is having an impact on daily life, but not a magical solution.