Figure 1  .

Detail magnification. Above: ophthalmoscopic image (DC); right: images of volume (Vol), flow (Flw), and velocity (Vel). The brightness of pixels in these images is in accordance with the values of volume, flow, and velocity, respectively. Right centre: flow image: square, variable in size (here 10 × 10 pixels), and possible locations for quantitative evaluation (r1-r4 = retina, p = optic nerve head); once the square is positioned at a certain location this location will be the same in all images (as demonstrated in r3 and in Fig 2) leading to values of volume, flow, and velocity of one location.