A method for treating vestibular impairment, comprising: (a) providing a virtual reality apparatus comprising: a headset; a smartphone having a computer processor, a camera, and a display screen; a case holding the smartphone attaching to the headset; a first optical arrangement, for focusing a field of view of the camera on the user's eye; a second optical arrangement for viewing the display screen; and an application and the processor adapted to display a stimulation exercise on the screen; wherein, the application records movements of the eye, during the exercise, using the camera; wherein the application determines user response competence to the exercise, based upon the movements; and accordingly modifies exercise degree of difficulty; (b) placing the headset on the user's head; (c) focusing the field of view onto the eye; (d) displaying the exercise; and (e) recording eye movements, using the camera.