I bought a pair of these enchroma $350 glasses for a friend with severe red/green color blindness. They may have helped somewhat for him to see some different hues. cant use them indoors.
I spoke to a teenager in church last week who had just gotten a pair. He was amazed to see the colors in the world that he had never see or suspected were there. He wears them indoors. They look like a very slight colored sun glass. He loves them.