I woke up one morning with one pupil widely dilated. No pain, no headache. I did have a lot of pressure in my head and neck. GP sent me to an opthalmologist who found nothing wrong with my eyes and did not have any idea what could be causing it. Said I must have somehow gotten a chemical in my eye without realizing it. My GP didn't buy that because I had no redness, watering, pain in the eye, or recollection of using chemicals. After a day it started going back to normal.
Next day the same thing, same pupil widely dilated. I had a CT scan which was normal, but still had eye problem. Had an MRI. the result? Huge inflammation of my sphenoid sinus, which was pressing on my brain and eye. I'm so relieved!
The reason I posted is because all my internet searches were not turning up anything on ONE pupil dilated unless it was something horrible like aneurysm, stroke, tumor. Searches on sinusitis show all kinds of symptoms that I do NOT have - no headache, cold, runny nose, eye swelling, facial sensitivity, etc. They do not mention pupil dilation as a symptom. Also, all the sites say a CT scan will diagnose sinusitis, but it did NOT in my case.
My hope is this might help someone else who cannot find the reason for a single pupil to be dilated, and maybe a CT scan did not show anything. Apparently this is really uncommon.
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