A system for adjusting an operating state of a medical electronic device is described. In an aspect, the system includes an optical tracking system configured to detect three or more tracking markers. The system also includes a processor coupled with the optical tracking system. The processor is programmed with instructions which, when executed, configure the processor to: configure an input command by assigning at least one operating state of the medical electronic device to a particular state of at least one of the tracking markers； after receiving a priming command, identify a present state of the tracking markers based on data from the optical tracking system； compare the present state with the particular state assigned to the operating state； and based on the comparison, determine that an input command has been received and adjust the operating state of the medical electronic device to the assigned operating state.
