![]() Patients may sometimes see flashes, although more frequently they see complex visual images like children or animals, which can look very real. The brain, deprived of real visual information, can make things up instead, particularly in conditions of low light. They can last up to an hour and tend to increase to a maximum before fading away and being replaced by a headache, which is typically one-sided and which may or may not be severe.Ĭharles Bonnet syndrome is a condition experienced by people, usually elderly people, whose vision is deteriorating. Usually, in migraine, these occur in both eyes simultaneously. Some people with migraine experience flashing lights. Again, these can affect one or both eyes.įlashes can also relate to migraines. These include diabetic eye disease and sickle cell disease. However, most vitreous detachment does not harm the retina.Ĭonditions which affect the retina may also cause flashes. Sometimes, as the vitreous pulls on the retina, it can tear it, causing a retinal tear or a retinal detachment. If they occur in both eyes this is because the same thing is happening in each eye separately (but since your eyes are usually very similar this is not unlikely to occur at the same time). The flashes of vitreous detachment may occur in one or both eyes. ![]() The vitreous is detached from the retina in 75% of people aged over 65 and this is usually harmless. This condition is harmless in itself, and in fact it happens to almost everyone eventually. ![]() Eventually the vitreous membrane tends to pull right off the retina, a condition called posterior vitreous detachment. This can cause flashes because the pulling triggers nerves in the retina and they send signals to the seeing nerve (optic nerve). ![]() As we age, the vitreous humour shrinks and as it does so it can pull on the retina. ![]()
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