visual snow syndrome
Findings
No curated finding names visual snow syndrome yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Visual snow syndrome is described as a persistent visual problem characterized by seeing snow-like dots. Migraines are a common symptom. Many people also see drifting blobs of varying size and shape (floaters), visual effects (entopic phenomenon), glare, halos, starbursts, trails, odd colors and shapes, and may have persistent recurrence of a visual image (palinopsia) and double vision. Additional symptoms may include fatigue, tinnitus, or depersonalization and depression. Most people have normal vision tests and normal brain images. Standard migraine treatments are often not helpful. There is no cure or effective treatment to completely relieve the symptoms, but medication seems to help some people with visual snow.
Definition from the Mondo Disease Ontology (MONDO:0018486), read 2026-09-29. CC BY 4.0.
Features
23 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Vitreous floatersHPOHP:0100832
- Very frequent (80% to 99% of cases)
- AnxietyHPOHP:0000739
- Frequent (30% to 79% of cases)
- Bipolar affective disorderHPOHP:0007302
- Frequent (30% to 79% of cases)
- DepersonalizationHPOHP:5200217
- Frequent (30% to 79% of cases)
- DepressionHPOHP:0000716
- Frequent (30% to 79% of cases)
- DerealizationHPOHP:5200218
- Frequent (30% to 79% of cases)
- Diminished ability to concentrate
Show the remaining 11
- NyctalopiaHPOHP:0000662
- Frequent (30% to 79% of cases)
- ParesthesiaHPOHP:0003401
- Frequent (30% to 79% of cases)
- PhotophobiaHPOHP:0000613
- Frequent (30% to 79% of cases)
- PhotopsiaHPOHP:0030786
- Frequent (30% to 79% of cases)
- Sleep disturbanceHPOHP:0002360
- Frequent (30% to 79% of cases)
- TinnitusHPOHP:0000360
- Frequent (30% to 79% of cases)
Where it sits
- A kind of