[jerf]

What boggles my mind a bit is that true colorblindness glasses don't seem that difficult to me. Standard red-blue 3d glasses almost do it, it's just you need red-green differentiating glasses. I don't think this would Open the World of Color!, but it would with a bit of practice probably allow you to at least perceive a difference.

But the glasses need to be visibly-differently (to a non-color-blind person) tinted. If they look the same, they're not going to work. Just like a "blue-reducing" pair of glasses needs to look visibly yellow, or it clearly (in all senses of the term) isn't doing anything.

A truly optimal pair would take some sciencing but bashing something prototype-quality with something like https://www.amazon.com/dp/B0928YT83C would be a matter of holding up the cyan-ist of the films up to one eye and the magenta-ist of the films to the other, and looking at some red and green things, concentrating on which eye the object is bright in.

[lupire]

RB 3GD glasses remove color to create a different image. I don't see how that would generalize to add color.

[drdeca]

If one removes red while the other removes green, then if something looks dark through the lens that blocks green, and looks bright in the one that doesn't block green (but blocks red), then one could tell that it is green. (and visa versa for something red)

Not that this would give the same subjective experience of a person w/o colorblindness seeing red vs seeing green, but I wouldn't be surprised if it allows one to pass r/g colorblindness tests fairly well?

[jerf]

It wouldn't. It would subtract, but differently for each eye. Differential subtraction between two eyes is not addition, but it has certain characteristics in common with it.