Our expert says:
These are signs that the optic nerve did not get proper blood flow for a small period of time. It can happen if your blood pressure drops very low, some people get it before migraines due to spasma of the artery to the eye, but it could also be a sign of retina detachment, which can cause blindness, so please see your doctor as soon as possible. He may need to refer you to an opthalmologist for a full examination.
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