Fig. 2From: Real-time computer-based visual feedback improves visual acuity in downbeat nystagmus – a pilot studySlow phase velocity (SPV) of the DBN during gaze straight ahead as well as sideways (both left and right 20° off center) for all ten subjects. In gaze straight ahead, the mean SPV is 1.4°/s and increases noticeably in left and right position (mean left 3.36°/s; mean right 3.58°/s)Back to article page