In a display device with optical sensors, a recognition processing portion performs recognition processing on a scan picture generated by optical sensors, and calculates a position. The scan tool is communicable with an OBD of an automobile and provides information retrieved therefrom to a user of the scan tool in an efficient and effective manner. Methods of treatment or therapies for treating chronic liver disease and chronic hepatitis are also provided. Other elements of the fluid-burning lamp include a fluid container for holding a combustible fluid to be used as fuel for the burn, and a wick assembly containing a wick having a lower portion that extends into the combustible fluid.