<unk>  is the presence of perceived flashes of light in the field of vision. It is most commonly associated with: * posterior vitreous detachment * migraine aura (ocular migraine / retinal migraine) * migraine aura without headache * scintillating scotoma * retinal break or detachment * occipital lobe infarction (similar to occipital stroke) * sensory deprivation (ophthalmopathic hallucinations) * age-related macular degeneration * vertebrobasilar insufficiency * optic neuritis * visual snow Vitreous shrinkage or liquefaction, which are the most common causes of<unk> , cause a pull in vitreoretinal attachments, irritating the retina and causing it to discharge electrical impulses. These impulses are interpreted by the brain as flashes. This condition has also been identified as a common initial symptom of punctate inner choroiditis (PIC), a rare retinal autoimmune disease believed to be caused by the immune system mistakenly attacking and destroying the retina. During pregnancy, new-onset<unk>  is concerning for severe preeclampsia.<unk>  can present as retinal detachment when examined by an optometrist or ophthalmologist. However, it can also be a sign of uveal melanoma. This condition is extremely rare (5–7 per 1 million people will be affected, typically fair-skinned, blue-eyed northern Europeans).<unk>  should be investigated immediately.
Photopsia
Palinopsia
Pelopsia
Micropsia
Dysmorphopsia
Cyanopsia
Akinetopsia
Macropsia