Patients with so-called ‘visual snow’ describe a persistent disturbance in the entire visual field resembling the ‘static’ or ‘snow’ of a badly-tuned analogue television. The symptoms are continuous and can persist over years. Although many primary care providers, ophthalmologists, neuro-ophthalmologists and neurologists have seen patients with such complaints, the problem remains undefined.
Source : Brain, Volume 137, Issue 5, May 2014, Pages 1419–1428
The cause of visual snow is unknown. It's often, but not always, associated with, and with a variety of other visual disturbances - and also with the hearing disorder .
Research has shown that the syndrome is not an eye problem as such, but appears to be a malfunction in the brain's visual system, specifically in the right lingual gyrus and left cerebellar anterior lobe.
There are currently no successful treatments.
Further info : VisualSnowSyndrome.com
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