> EnChroma’s technology works by placing a band of absorption on glasses that captures light, pushing the cones away from each other and reestablishing the normal distribution of photons on them.
The glasses are not pushing the cones on your retina apart (if they are you're probably wearing them a bit close), so what are they doing?
http://enchroma.com/technology/how-it-works/
It seems like a pretty straightforward band-pass filter in the visible frequency range. I don't know enough about eye physiology or chemistry to say whether that would really have the effect they claim, but it sounds like plenty of people have already tried them and found them useful somehow.
[0] 99% number is from the article. I have no idea if that's accurate or not.
Edit: Clarifying wording, spelling
One form of color blindness arises when the green and red peaks are especially close, making a large span of wavelengths look yellowy. By filtering those out, the person can get color vision.