Uniplanar Nystagmus Associated with Perceptual and Cognitive Visual Dysfunction due to Presumed Focal Ischemic Occipital Cortical Atrophy: A Missed Diagnosis and New Observation
Table 1
(a) Perceptual visual difficulties described by the patient
Features
Problems
Features of dorsal stream dysfunction
Impaired ability to handle complex visual scenes
Drop in visual acuity for crowded letters
Tendency to get lost in crowded location
Difficulty to see things on patterned background
Cannot cope with supermarkets
Cannot see things pointed out in the distance
Need to view television from a distance of 30 cms
Impaired visually guided movement
Negotiating steps and kerbs
Cannot cross roads
Bumping into objects
Hates going out at night
Intensely dislike furniture being moved because she then bumps into it
Impaired attention
Cannot recognize faces when concentrating on other things
Features of ventral stream dysfunction
Impaired recognition
Cannot differentiate between different makes of cars
