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This is an aura of ocular migraine and it should settle soon . If you have associated headache as well you can take some medicines like NSAIDs or Aspirin to treat the symptoms .
Feel free to ask if any more question
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They can change positions from one eye to other and can be lengthy as well .If your vision is also compromised then you should see the doctor now
So nothing to worry about as it is an aura of migraine and you should feel better soon