content: Try asking in /v/eli5, if you're serious. I'm sure someone has a good answer. Or, you can read their description of how it works (it's more technical though): http://enchroma.com/technology/ Or here is a video of some dude explaining how they work (I can't guarantee he knows what the hell he's talking about though): https://youtu.be/QHKXb3tXj24?t=10m43s Or if you already know how colour vision works, you may want to skip his rudimentary explanation of colour vision: https://youtu.be/QHKXb3tXj24?t=13m44s Or, if you want my explanation (I have no scientific background): As I understand it (and maybe I don't at all), they basically filter out certain parts of the visible spectrum that are troublesome for people with colourblindness - where there is colour overlap (blue/green and green/red). I guess with little or no overlap in colours, each colour appears more distinct from it's normally overlapping colour.