Experiencing or witnessing a terrifying event can trigger post-traumatic stress disorder (PTSD). Flashbacks nightmares severe anxiety and uncontrollable thoughts about the event irritability and angry outbursts difficulty sleeping are some of the symptoms of PTSD. If you’re suffering from this mental health condition your eyes can tell it all. Researchers can now tell if you have suffered traumatic experiences in the past by measuring your pupils. A UK-based pupillometry study found that the pupils of people with PTSD did not constrict quickly in response to increases in light. The findings were recently published in the journal Biological Psychology. For the