Equipment Eye Tracking System of foreign technology is mainly used in the detection Infrared Sensor eyes. Both sides and 2 patients staring to the desired location. And use the blink 1 times instead of pressing Enter which will have problems with elderly patients.Patient characteristics or sleep is to tilt the neck when they intend to choose or print position A but Infrared Sensor back to hold the position. B effect is equipment of foreign countries, do not work well.