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A member asked:
What could have caused a sudden blind spot in my left eye that impaired about 40% of my vision?
A doctor has provided 1 answer
Need eye exam ASAP: There are many possible causes. If the blind spot was temporary and the visual loss completely resolved, this could be a visual migraine (which usually affects both eyes) or even a transiet ischemic attack (TIA) - which is much more serious and should be evaluated immediately. If the loss remains, retinal problems such as a vein occlusion, retinal detachment, or an optic nerve problem are possible.
Answered 4/27/2015
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