When I have flashbacks, I become so hyperfocused on the memory that I lose touch with my actual body. So to answer your question, I probably have my eyes open most of the time, but my brain makes that information less of a priority... if that makes sense... like, I can see, but I'm looking at something else, something in my head. As a person with psychosis, I would say it is a different experience from hallucinating. Well... eh... it's complicated.