Oscillopsia associated with dysfunction of visual cortex.
OBJECTIVE
To investigate the cause of oscillopsia without nystagmus or vestibular dysfunction in a 31-year-old man with no past history of serious illness.


METHODS
The changes in the regional cerebral blood flow elicited by visual stimuli were studied by positron emission tomography (PET) in the patient and were compared with changes in normal subjects. The primary visual cortex (PVC) and area V5 were defined on Talairach coordinates, as shown in previous PET studies, and were confirmed with their activation patterns in our subjects.


RESULTS
Flicker stimulation (8 Hz) and a stationary random dot pattern activated area V5 in the patient, but not in the six normal controls. A moving random dot pattern activated both the PVC and the extra-striate cortex in both the patient and the controls.


CONCLUSIONS
Oscillopsia in this case is associated with dysfunction of the visual cortices and may be caused by it.
Suzuki
Yukihisa
Y
Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University Graduate School, Tokyo, Japan.
Kiyosawa
Motohiro
M
Mochizuki
Manabu
M
Wakakura
Masato
M
Ishii
Kenji
K
Senda
Michio
M
D000328:Adult; D001931:Brain Mapping; D002560:Cerebrovascular Circulation; D002561:Cerebrovascular Disorders / Q000150:complications* / Q000000981:diagnostic imaging; D004585:Electrooculography; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009039:Motion Perception; D015835:Ocular Motility Disorders / Q000209:etiology*; D010468:Perceptual Disorders / Q000209:etiology*; D012039:Regional Blood Flow; D014055:Tomography, Emission-Computed; D014793:Visual Cortex / Q000098:blood supply* / Q000000981:diagnostic imaging