"Silent Migraine"?
From time to time I get an aural display of lights in one eye. No pain or other symptoms. It's just a slight visual disturbance. The display only last a minute or so but then there's a slight headache around the eye for about 30 minutes. My GP suggests it might be a Silent Migraine.
I looked it up in Google. Too inept to post the link but you might give it a read.
Of course, do see your doctor. Mine seem to happen when I'm fatigued or stressed.
Dea