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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Visual snow syndrome presents as persistent, widespread flickering dots resembling TV static.
  • It is often associated with migraine but is considered a distinct entity.
  • Understanding its unique characteristics and biological underpinnings is crucial.

Purpose of the Study:

  • To review recent literature on visual snow syndrome.
  • To define diagnostic criteria for future research.
  • To investigate the relationship between visual snow syndrome and migraine.

Main Methods:

  • Literature review of recent studies on visual snow syndrome.
  • Analysis of associated visual and non-visual symptoms.
  • Evaluation of brain imaging data, specifically looking for hypermetabolism in visual cortex areas.

Main Results:

  • Visual snow syndrome is a unique persistent visual phenomenon.
  • Patients with visual snow syndrome exhibit hypermetabolism in the supplementary visual cortex (lingual gyrus).
  • This hypermetabolism overlaps with areas associated with photophobia in migraine, suggesting a link.

Conclusions:

  • Visual snow syndrome has a clear biological basis, evidenced by brain hypermetabolism.
  • The findings support a close relationship between visual snow syndrome and migraine.
  • Further research using defined criteria is needed to fully elucidate the syndrome.