Background and objective: A steadily increasing number of publications indicate the emergence of a new field in clinical psychology that may be called "clinical cyber psychology". An attempt is made to give a survey of recent results of applying "virtual realities" (VR) to psychological assessment and treatment. Method: The present study distinguishes between three approaches: a) E-therapy, b) VR-therapy, and c) VR-teletherapy. By and large, these distinction categories (E, VR, and VR-tele) apply also to psychological assessment, counseling, and rehabilitation. Results and conclusions: Computer-generated 3 D virtual realities provide a high level of control of both stimulus presentation and interaction between patients and the virtual environment. It is hoped that the application of virtual reality technologies may contribute to essential improvements in the field of psychological assessment and treatment.