This is just personal, but once I had to help my aunt during an extreme bipolar episode. She was violent, paranoid, and hallucinating. One of the most haunting things from that time was her eyes. They seemed hard and staring. When she looked at you, it didn’t feel like it was her in there. Her eyes weren’t shiny and expressive like normal. There was just something frantic and non human in them. Maybe it was just the extreme stress from feeling like people were coming for her, but it’s interesting to hear another avenue for getting insight into mental health disorders.