Visual Snow Diagnostic Criteria
If you suspect you may have Visual Snow please print and show this to your doctor.
- A. Dynamic, continuous, tiny dots across the entire visual field, persisting for more than 3 months.
- B. Additional visual symptoms of at least two of the following four types:
- Palinopsia (persistent recurrence of a visual image and/or trailing images after the stimulus has been removed)
- Enhanced entoptic phenomena*
- Photophobia (sensitivity or intolerance of light, which can cause some people to avoid sunlight, computers, fluorescent lights and car headlights)
- Nyctalopia (impaired night vision)
*excessive floaters in both eyes, excessive blue field entoptic phenomenon (uncountable little grey/white/black dots or rings shooting over the visual field of both eyes when looking at homogeneous bright surfaces such as the blue sky), self-lighting of the eye (colored waves or clouds perceived when closing the eyes in the dark) and spontaneous photopsia (bright flashes of light).
Peter Goadsby, MD PhD
Professor of Neurology
Owen White, MD PhD FRACP
Professor of Neurosciences
Victoria Susan Pelak, MD
Professor of Neurology and Ophthalmology
Yasser Khan, MD FRCSC
Oculoplastic, Orbital and Ophthalmic Surgery
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