The purpose of this study was to examine the fusion area in a real image and binocular disparity when the viewing distance was changed. As a result, when the viewing distance was short, the fusion area in the real image increased. However, the fusion area in the binocular disparity image did not increase as it did in the real image. Since the depth of field with the real image was shallow when the viewing distance was short, it was easy to perceive blurring. In binocular disparity images, since images of the front and back are not blurred, it is impossible to expand the fusion area of binocular disparity, to confirm whether it is expanded by blurring, we measured the fusion area when the binocular disparity image is blurred. As a result, the fusion area of binocular disparity was wider than in the real image when binocular disparity image was blurred.
