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Hi and thanks for the query.
The nerves that supply the eye, the retina and the periorbita do not originate from the neck but come directly through the skull from the brain to supply these areas. Since, you have a blind spot in your field of vision, I would suspect retinal hemorrhage or retinal artery stroke. Such sudden blind spots are also seen in Ocular migraines, which are not headaches but sudden onset blind spots in the field of vision that last a few minutes to a couple of hours.
I would suggest that you get yourself evaluated at your physician's office at the earliest.
If you experience any other symptoms like headache, nausea, vomiting, dizziness, confusion, slurring of speech etc. then you should go to the A and E or an Urgent Care.
Hope this helps.
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