A method performed by a wearable device (110, 210, 1002) that can be worn on a user's head, comprising a display being transparent such that a user is able to view of a foreground (252, 302, 352, 502) through the display, a front view sensor (118, 218, 718) to capture image data of the foreground, a display and an eye detection sensor to detect position and/or movement of the user's eye, comprising: displaying to the user an image on the display, in front of a portion of the foreground; acquiring,, data associated with the portion of the foreground (252, 302, 352, 502) corresponding to the image displayed on the display from the captured image data; determining an image characteristic of the foreground (252, 302, 352, 502) based on the acquired data; detecting a change in the image (256, 306, 356, 506) displayed on the display, wherein the change in the image (256, 306, 356, 506) includes a change in at least one of a content of the information or a type of the information provided by the image (256, 306, 356, 506); detecting a change in the image characteristic of the foreground (252, 302, 352, 502); determining whether the user has viewed the image displayed on the display; adjusting, upon the detection of the change in the image (256, 306, 356, 506), a display characteristic of the image (256, 306, 356, 506) based on the change in the image (256, 306, 356, 506) and the image characteristic of the foreground (252, 302, 352, 502), or adjusting upon detection of a change in the image characteristic of the foreground a display characteristic of the image (256, 306, 356, 506) based on the changed image characteristic of the foreground (252, 302, 352, 502) unless it has been determined that the user has viewed the image displayed on the display and that there is no change in the image displayed on the display. displaying to the user an image on the display, in front of a portion of the foreground; acquiring,, data associated with the portion of the foreground (252, 302, 352, 502) corresponding to the image displayed on the display from the captured image data; determining an image characteristic of the foreground (252, 302, 352, 502) based on the acquired data; detecting a change in the image (256, 306, 356, 506) displayed on the display, wherein the change in the image (256, 306, 356, 506) includes a change in at least one of a content of the information or a type of the information provided by the image (256, 306, 356, 506); detecting a change in the image characteristic of the foreground (252, 302, 352, 502); determining whether the user has viewed the image displayed on the display; adjusting, upon the detection of the change in the image (256, 306, 356, 506), a display characteristic of the image (256, 306, 356, 506) based on the change in the image (256, 306, 356, 506) and the image characteristic of the foreground (252, 302, 352, 502), or adjusting upon detection of a change in the image characteristic of the foreground a display characteristic of the image (256, 306, 356, 506) based on the changed image characteristic of the foreground (252, 302, 352, 502) unless it has been determined that the user has viewed the image displayed on the display and that there is no change in the image displayed on the display.