An adjustable and foldable device for visual field testing or treatment includes a computer display mounted on a base and presents visual stimuli to the patient. An associated head support assembly with a chinrest supports and positions the head of the subject with respect to the display. An articulated arm joins the base and the head support assembly. The arm will resist a given downward force supplied by the head, and is foldable toward the display to create a more compact and portable device. Additional articulations may allow the head support assembly to fold upon arm, and the arm to fold upon the base. The device may include a locking mechanism that secures the device in a folded or unfolded configuration.