![]() However, as attacks are usually brief it's more likely you'll be diagnosed based on an account of your symptoms. In this case the GP or optometrist may be able to make a confident diagnosis of retinal migraine. ![]() If you manage to see a GP or optometrist during an attack, they may be able to see the decreased bloodflow to your eye using an instrument called an ophthalmoscope. There are other more serious causes of sight loss that doctors will want to rule out. It's important to see an optometrist or medical doctor urgently if you suddenly lose your eyesight, particularly if it occurs for the first time. Use our directory to find opticians or find GP services. If your eyesight suddenly deteriorates, make an emergency appointment to see an optician trained to recognise eye abnormalities and signs of eye disease (optometrist), your GP, or call NHS 111. Some people see a mosaic-like pattern of blank spots (scotomas), which enlarge to cause total loss of vision. Vision may slowly become blurred or dimmed, or there may be flashes of light. The same eye is affected every time in almost all cases. ![]() It's unusual for an episode of vision loss to last longer than an hour. ![]()
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