[gizmo686]

Our eyes essentially convert incoming light into three scalar values (one for each of our three cones, S, M, and L). The specific color blindness that this article is talking about is not really color blindness, but rather two of these cones overlapping more than usual. In theory, by filtering out the wavelengths of light in these overlapping regions, you can improve the wearers ability to perceive differences in color. Of course, this also affects percieved brightness, and their is no good way of knowing if the user is telling the difference based on the fact that the signal is being picked up by different cones, or the fact that it is being picked up as a different brightness.

[bonobo]

I thought they were talking about dichromatism, I missed the part where they say it fixes anomalous trochromatism only. It makes sense now, thanks.

[jacobolus]

Deuteranomaly/protanomaly are between them something like 2.5 times as common as deuteranopia/protanopia (other color vision deficiencies besides those four are very rare). So this should still be very helpful to most “colorblind” people.