1. A method of displaying multiple source images via a display monitor device to first and second eyes of a viewer for fusion into a single useful image, the method comprising: a) acquiring a first image from a first imaging source associated with a first viewing field; b) acquiring a second image from a second imaging source associated with a second viewing field that overlaps or is adjacent to the first viewing field; and c) alternating, on the display monitor device, a visual display of the first image with a first black field and the second image with a second black field sequentially, wherein durations of the visual displays of the first and the second images, and durations of the visual displays of the first and the second black fields are selected based on durations of retinal decays in the first and second eyes, to achieve fusion of the first and second images.