I don't believe the glasses help to see more colours, just to differentiate better. A person with colour blindness has faulty receptors, so there's nothing that can help expand the colour range. Gene therapy may eventually provide a cure, or finding a way to wire an electronic gadget directly to the visual cortex. As things are now, you can't actually make someone "see" a color their eyes aren't able to distinguish; some kind of filtering has to be involved. Either that, or snake oil.

My son appears to be colour blind so it's a subject I follow.

There is a lot of tosh regarding colour vision out there; an online test claims to be able to allow you to see if you have Tetrachromic vision. It's complete and utter garbage, full of false statements, false claims and a test that cannot possibly work on a computer screen.

Coppula eam se non posit acceptera jocularum.

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