Tried them, all they did for me was shift my colorblindness. So really wasn't helpful for me. Plus they didn't work indoors, only outdoors in bright light.
I describe the affect they had was when you go outside and put on sometime of sunglasses and it make the colors more vibrant.
Is you son able to identify colors? Especially for things that he wouldn't know what color they are? When your are CB you learn to figure out or remember what color something is. So I have shirts that I wouldn't be able to tell you what color they are if someone just bought them for me, but since I own them I know what color they are. A