Howdy from up here in "da Bronx".
This is a tough question to answer. The thing that confuses me is that the SAME visual field was involved each time. This suggests some sort of LOCAL problem. For a blood clot from intermittent A-fib to travel to the EXACT same tiny artery 3 times in a row seems strange.
Having said that, coumadin IS commonly recommended to patients with intermittent A-fib even without a known history of clots.
Asking your MD to consider putting you on coumadin is a good idea; seeing a cardiologist for a second opinion might be useful also.
And just a thought...plavix as an alternative to suggest if he rules out coumadin?
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And a BONUS is always appreciated.