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I often see purple lights in my vision outdoors at night ... I wondered what the scientific explanation for this phenomenon might be?
Phosphenes are brief spots of light brought on by eye movement (movement phosphenes) or sudden noises (sound phosphenes) and which last for less than a couple of seconds. Such phosphenes are often associated with optic neuritis and are caused by mechanical aggravation of a damaged or inflamed optic nerve. They are usually more obvious in low light conditions.
I have recently had a brain MRI and EEG for unrelated issues which came back clean and also have had an eye test which revealed 20 20 vision.
The recognition, diagnosis and management of cerebral vasculitis ...imaging by computed tomography or magnetic resonance imaging (MRI) is likewise wholly lacking in sensitivity
Table 1 Cerebral vasculitis: suggested clinical patterns of presentationwhich might facilitate recognition (adapted from Scolding et al., 1997) ... Superﬁcially resembling atypical multiple sclerosis (‘MS-plus’) in phenotype – with a relapsing–remitting course and features such as optic neuropathy and brain stem episodes but also accompanied by other features less common in multiple sclerosis – seizures, severe and persisting headaches, encephalopathic episodes or hemispheric stroke-like episodes