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yes, it is possible for a clot or plaque to break off in your carotid artery and spread to the brain to cause a stroke and damage part of the brain and cause hemianopsia or decreased vision or blindness in half the visual field
did this happen to you?
did you have a brain MRI scan to look for signs of stroke brain damage?
there is the circle of willis in your brain where clots from your carotid artery can get to the occipital lobe of your brain.