A friend has struggled with PTSD (post-traumatic stress disorder) for many years, and has just started EMDR (Eye Movement Desensitization and Reprocessing) therapy. She found it unusual and felt uneasy at first, but after a few sessions could feel a positive effect.
EMDR therapy has been declared an effective form of trauma treatment by a wide range of organizations. In the United States these include the American Psychiatric Association, the International Society for Traumatic Stress Studies, and the Departments of Defense and Veterans Affairs.
This article in PsychCentral explains the therapy treatment.