An apparatus and an associated method are disclosed for treating vestibular, ocular or central impairment. The apparatus comprises a headset, a mobile computer device having a computer processor, at least one camera and a display screen, a case adapted to hold the mobile computing device and to attach to the headset, an optical arrangement associated with the case and an application associated with the processor, whereby the application and the processor are adapted to display at least one stimulation exercise on the screen using virtual reality. The method includes placing the headset on the head of a user, displaying the stimulation exercise on the screen, determining a response and providing a modified exercise of a different degree of difficulty based on the determined response.
