Are contact lenses an effective treatment against color blindness?

A friend of mine has just find out she is a red-green color blind. Althoght saying that it is not going to change her life that much, she get clearly worried abou that.

I've searched for treatment on color perception deficiences and I've read that there is a kind of red-filtering contact lenses that reduce the amount of light perceived in people with achromatopsia and is supposed to correct the vision of bichromat color blind. But the question is: do these lenses really work? I say, I'm not sure if she really will be able to see like a normal person.

If you understand these things, I'll be satisfied with your help.

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