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Oscillopsia associated with dysfunction of visual cortex.

Yukihisa Suzuki1, Motohiro Kiyosawa, Manabu Mochizuki

  • 1Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University Graduate School, Tokyo, Japan.

Japanese Journal of Ophthalmology
|April 3, 2004
PubMed
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This study investigated oscillopsia in a patient with no vestibular issues. Positron emission tomography revealed abnormal visual cortex activation, suggesting a link between visual cortex dysfunction and oscillopsia.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Medical Imaging

Background:

  • Oscillopsia, the sensation of visual world instability, typically involves vestibular or ocular motor dysfunction.
  • This case presents a unique instance of oscillopsia without these common underlying causes.

Purpose of the Study:

  • To determine the cause of oscillopsia in a 31-year-old male with no prior significant medical history.
  • To explore the role of visual cortex function in the manifestation of oscillopsia.

Main Methods:

  • Positron emission tomography (PET) was employed to assess regional cerebral blood flow changes in response to visual stimuli.
  • The patient's brain activity was compared with that of six healthy control subjects.
  • Primary visual cortex (PVC) and visual area V5 were identified using established Talairach coordinates and activation patterns.

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Main Results:

  • Area V5 showed abnormal activation in the patient during 8 Hz flicker stimulation and with stationary random dot patterns, unlike in controls.
  • Both the patient and controls exhibited activation in the PVC and extra-striate cortex when viewing a moving random dot pattern.

Conclusions:

  • The findings suggest that oscillopsia in this patient is linked to dysfunction within the visual cortices.
  • This case highlights a potential neurovisual basis for oscillopsia, independent of vestibular system impairment.