1. A method of improving the visual function of a patient with visual defects comprising the steps of: determining a visual dysfunction relating to a visual field of view of the patient; obtaining image data relating to a predetermined portion of the visual field of view of the patient; modifying substantially in real time a predetermined portion of the image data with an electronic processor to generate a modified image data in dependence upon a predetermined portion of the determined visual dysfunction; and displaying the modified image data to the patient.