Figure 4. Summary of measurements of gaze stability, expressed as median eye speed, for 20 control subjects (box plots) and for individual patients studied for each directional component.

For patients with monocular visual loss, SD values of eye speed were greater in the eyes with poorer vision (less so for P5 and P6 with late onset of visual loss due to ARMD). The fastest eye-drift speeds were shown by P7, who had been blind since birth.