1. A device that allows a subject having diseased retina to utilize a functional area of the retina to see a more complete image of the subject's field-of-view, the device comprising: one or more cameras, a microprocessor, and one or more display screens, wherein the microprocessor comprises an algorithm programmed to transform the images received from the one or more cameras according to a map of the functional area of the subject's retina, wherein the transformation of the images comprises: a) removing portions of the images corresponding to a non-functional area of the subject's retina; b) modifying a color and/or contrast of the portions of the images corresponding to the non-functional area of the subject's retina; c) generating contours of the portions of the images corresponding to the non-functional area of the subject's retina; and d) overlapping the modified portions of the images from step b) and the contours from step e) with portions of the images corresponding to the functional area of the subject's retina to produce transformed images; and wherein the device projects the transformed images onto the functional area of the subject's retina.