A wearable device (110) includes a display component (210) configured to display a virtual image. The wearable device (110) also includes a first sensor (250) configured to generate a first signal indicative of a physiological condition of a user. The wearable device (110) further includes a controller (220) configured to determine the physiological condition based on the first signal, and control the display component (210) to display the physiological condition.
