Gurney -
When I use my rouge-o-phile glasses (both are prescription too) I have a simple scheme - one red light stop, two red lights - dither - no red lights - go.
But seriously all colours to a normally sighted person are interpreted by the brain and after a while the mind compensates for the lens colour except for certain blues - which can look purple or a sort of cyan or just different.

But they do cut down the light as sunglasses and increase the contrast in the light/dark of a scene. As any black and white photographer will tell you.