This is experimental EMDR Therapy. Please be careful. It can be getting very intense.
Eye movement desensitization and reprocessing (EMDR) is a form of psychotherapy developed by Francine Shapiro in the 1990s in which the person being treated is asked to recall distressing images; the therapist then directs the client in one type of bilateral sensory input, such as side-to-side eye movements or hand tapping. It is included in several evidence-based guidelines for the treatment of post-traumatic stress disorder (PTSD).
It has been controversial; critics have argued that the eye movements in EMDR do not add to its effectiveness and lack a falsifiable theory. While multiple meta-analyses have found it to be just as effective as Trauma focused cognitive behavioral therapy for the treatment of PTSD, these findings are tentative given the low numbers in the studies, high risk rates of researcher bias and high dropout rates.
This is just for experimental usage – we are no doctors nor psychologists.