1. A head-mountable device, comprising: a frame comprising an external side and an internal side, wherein the internal side substantially faces a front of at least one eye when the head-mountable device is worn; an array of visual indicators mounted along at least a portion of the internal side of the frame, wherein the array of visual indicators is arranged on the frame such that when the head-mountable device is worn, the visual indicators emit light towards the at least one eye; and a computing system configured to: receive image data of a first field of view of an environment, wherein the first field of view corresponds to a field of view of an image-capture device mounted on the head-mountable device; detect an object within the image data of the first field of view of the environment, wherein the object is outside of a second field of view, wherein the second field of view corresponds to a field of view of a wearer of the head-mountable device when the head-mountable device is worn; determine a relative spatial location of the object with respect to the second field of view; and cause the array of visual indicators to indicate the relative spatial location of the object.