Systems and methods are disclosed for capturing and displaying real-time images of the environment in front of a user. In one implementation, a casing for a mobile device having an upward facing display surface and an opposing lower surface is provided. The casing may include a housing and image sensor having at least one optical axis configured to be oriented at a fixed obtuse angle with respect to the lower surface when the mobile device is retained by the housing. The image sensor may be oriented such that when the housing is held by a walking user at an acute angle with respect to a plane on which the user walks, the at least one optical axis generally faces in a walking direction of the user. The casing may further include circuitry for conveying from the at least one image sensor, image data for real-time display on the display surface.