I'm on my second Model X 90D both 2016 models and noticed the double vision at night for both. I notice it more when looking at LED taillights/headlights of other cars. I noticed it more on the first X I had and the second, a loaner, is not as bad. It is still very annoying. I've been in the automotive business for a while and have owned a number of vehicles and have never experienced anything like this. My sales guy mentioned his colleague notices it on his Toyota truck. I'm pushing with the store manager to find out what Tesla is doing about it as I'm concerned I will have the same problem with my the new X currently being built. I have a family member in manufacturing and has experience with the manufacturing of windshields and he says it is all related to the layers of glass or whatever other material is used with the glass and how each layer is lined up. He says it is not manufactured correctly if you can see double or even triple.