Blue eyes are less pigmented than dark eyes. I have blue eyes. When oncoming lights are seen when driving at night, it means my retina is flooded with more light, thus it takes me longer than others to get back my night vision. This is not so much an eye question as a general question about light processing.
In driving school, we were taught this as well.
As for the cloudiness, I cannot address that, as I do not know what it is they're trying to treat with that.
I'm going to refer you to the eye category for this question.