Unlikely but possibl: One eye infection, orbital cellulitis can do that. It is rare and the symptoms would be obvious (pain, redness, swelling, changes in vision). Diabetics are a little more vulnerable to this.
Answered 1/14/2015
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Viruses and parasite: Infections in the retina such as herpes viruses and some parasites can infect the brain as well, especially when the immune system is suppressed such as with chemotherapy, organ transplants and aids.
Answered 9/11/2013
4.9k views
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