1. A display apparatus comprising: at least one focus display; a processor coupled to the at least one focus display, wherein the processor is configured to render a focus image at the at least one focus display, wherein an angular width of a projection of the rendered focus image ranges from 5 degrees to 60 degrees, wherein the display apparatus is arranged to be detachably attached to a portable electronic device and to be communicably coupled with the portable electronic device, and wherein a processor of the portable electronic device is configured to render a context image at a display of the portable electronic device, wherein an angular width of a projection of the rendered context image ranges from 40 degrees to 220 degrees, means for detecting a gaze direction, wherein the processor of the display apparatus is configured to communicate the detected gaze direction to the processor of the portable electronic device; wherein the processor of the portable electronic device is configured to: (a) obtain an input image, and use the detected gaze direction to determine a region of visual accuracy of the input image; (b) process the input image to generate the context image and the focus image, the context image having a first resolution and the focus image having a second resolution, wherein: (i) a region of the context image that substantially corresponds to the region of visual accuracy of the input image is masked, (ii) the focus image substantially corresponds to the region of visual accuracy of the input image, and (iii) the second resolution is higher than the first resolution; and (c) communicate the focus image to the processor of the display apparatus; and wherein the projection of the rendered context image is combined with the projection of the rendered focus image to create a visual scene.