They diagnose you as colorblind using those Ishihara color tests, and apparently that second test from the video.

What I don’t understand about any of these videos about these glasses I’ve seen is, why don’t they repeat the tests with the glasses on?

If you can pass all of the colorblindness tests with the glasses on, then you’d say that the glasses work, even if they make everything magenta. Based on his orange-red blindness from the last glasses, I suspect that they might make you pass the tests your previously failed, but then you’d fail some tests that you previously passed.

It seems like the most basic way to verify whether the glasses work, and the first thing that people should think to test, but I’ve never seen anybody do it.