When your vision is not as good as usual from drinking, so you find people you would not usually find attractive, attractive.
Dylan: "why did you hookup with that guy?"
Sue: "I had drunk vision! Blame it on the alcohol."
When you are so drunk and high that your vision is limited as if you are looking out of binoculars.
I was so drunk and high that I had drunk tunnel vision and ended up blacking out.