[Ambulatory autonomy and visual motion perception in a case of almost total cortical blindness].
A 37-year-old man experienced cortical blindness following a bilateral stroke in the territory of the posterior cerebral arteries. Four years later, the measurement of visual field defects (Goldmann perimeter) showed persistence of bilateral blindness with a 2-degree preservation of macular vision and a perifoveal sparing between 10 to 30 degrees of eccentricity in the left inferior quadrant. Despite this visual impairment, the subject was able to perform visually-guided locomotion. Moreover he consciously perceived visual motion in the blind parts of his visual field. CT and MRI showed a lesion involving most of the striated cortex. The visual cortex located in the internal occipito-parital regions was relatively spared. The contribution of this structure to extra-striated vision of motion is discussed.
Ceccaldi
M
M
Service de Neurologie et de Neuropsychologie, CHU Timone, Marseille.
Mestre
D
D
Brouchon
M
M
Balzamo
M
M
Poncet
M
M
D000328:Adult; D001766:Blindness / Q000209:etiology / Q000503:physiopathology*; D002540:Cerebral Cortex; D002544:Cerebral Infarction / Q000150:complications / Q000175:diagnosis; D005684:Gait; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009778:Occipital Lobe; D014057:Tomography, X-Ray Computed; D014794:Visual Fields; D014796:Visual Perception
Autonomie déambulatoire et perception visuelle du mouvement dans un cas de cécité corticale quasi totale.