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PO069 Clinical characterisation of visual snow
  1. Francesca Puledda1,
  2. Lau Tze1,
  3. Christoph Schankin2,
  4. Peter Goadsby1,3
  1. 1Department of Basic and Clinical Neuroscience, IOPPN, Kings College Hospital
  2. 2Department of Neurology, Inselspital University of Bern, Bern, Switzerland
  3. 3NIHR-Wellcome Trust King’s Clinical Research Facility, King’s College London, UK


Patients with visual snow suffer from pan-field, dynamic visual disturbance. Proposed diagnostic criteria require at least two additional visual symptoms from: palinopsia, entoptic phenomena, photophobia and nyctalopia. We characterised patients’ clinical symptoms with regard to the current criteria. An online survey was prepared in collaboration with the patient group Eye-on-Vision. Patients were directed to the site after they contacted us by email asking to be involved in research. The study was approved by the KCL Research Ethics Panel. Of patients (n=514) replying, 280 were male, with a mean cohort age of 29±10 years. They presented with black and white (n=287), coloured (n=222), flashing (n=227) and transparent (n=272) static, with an average of two types of static reported per patient. Floaters (n=446) were the most common associated symptom, followed by afterimages (n=428) and photophobia (n=405). The data confirm earlier work and extend the analysis of the overlapping symptoms. Visual snow can be a highly disabling syndrome that is now becoming better understood as it is recognised and systematically studied.

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