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Table 1 Etiology of the DBN syndrome (idiopathic cerebellar syndrome; cerebellar atrophy; CANVAS), duration of visual symptoms and visual acuity as measured by orthoptic exam (Snellen chart, CC “cum correctione”) as well as SPV in gaze straight ahead (Landolt C, SC “sin correctione”)

From: Real-time computer-based visual feedback improves visual acuity in downbeat nystagmus – a pilot study

Age/sex Etiology Duration of symptoms (years) Visual acuity Snellen chart SPV in center gaze in °/s
72/m idiopathic 10 0.6 2.5
65/f idiopathic 3 1 1.47
82/f CANVAS 4 0.75 0.1
79/m idiopathic 13 0.6 1.0
75/f CANVAS 7 0.25 3.0
80/m idiopathic 7 0.75 3.5
55/m CANVAS 3 0.8 0.06
59/f idiopathic 6 0.8 1.0
78/f atrophy 7 1 0.8
77/f idiopathic 3 0.58 1.0
Mean - 6.3 0.71 1.44
SD - +/-3.13 +/-0.21 +/-1.18