How are you doing today Larry...S.M.? I hope that you are both well.:)
Larry, I read an account once of a person who would suffer an attack always on their way home. It took them awhile, but they figured out that it was because out of the corner of their eye, they were seeing plowed fields in rows along the route, and the flickering/repetitve movement was enough to trigger their A/P.
I have trouble with some flourescent lights if they are 'flickery'...and have to limit any video games with rolling screens...and avoid the ones that have a strobe effect all together!
S.C.