Simple solution to deal with Epilepsy attack (PSE)?

[Flying Pencil]

Originally Posted by Voyager

Machine guns firing tracers
Propeller when turned into the sun
rolling scissors on a bright clear day
The effects of night bombing at low level
Fuel dumps going up

WWII flight sims are about things exploding at 400 mph. At certain geometries you can have things whip past so fast that they're only in view for one frame. This is a known problem with flight sims, but because the flightsim market is so small, and the epileptic population is so small, they rarely interact.

A single flash does not cause PSE (otherwise flash photo would be banned)
Small flashing lights do not cause PSE (otherwise you would never see a blinking clock)

The only item that has by far the greatest chance for PSE, and that is the propeller.

So, yes, what was this test that seemed to cause so many to have PSE??