[KarlInOhio]

Too bad they didn't give a hint on what technology they used for this. Did they just saturate the reds and greens on video? That would help the anomalous trichromats but not true dichromats or monochromats. Did they put glass with a notch filter in the wavelengths between the L and M cones?

If either the M or L cones are missing you'll be very red-green color blind. If one or the other is weak or if they are shifted to be closer to each other then you'll be moderately color blind. You'll be able to see bright colors like fall leaves but miss out on subtler variations.

[Yardstick]

I did some quick googling and it seems they are using the same technology as the glasses mentioned earlier — i.e. passive notching rather than video saturation of colors.

[Blood of Tyrants]

The glasses actually filter out a narrow band of where the red and green overlap, giving more definition to the remaining colors. It doesn’t work for everyone.

[beef]

I might be wrong, but I think the video rotates from uncorrected color to a colorblind view for those with normal color vision, to a corrected view for the colorblind.