Our Perfect Master spoke of charges hitting the retinaand causing them to “fire” off the rods or cones in the retina, which low earth orbiting astronauts see as flashes of light. But I recall the astronauts that went to the moon also saw flashes of light when they closed their eyes. The explanation trotted out back then was the result of Cerenkov light (particles that travel through a medium–in this case vitreous humor-- faster then than light can travel generates a kind of “light” shock wave) which in turn was picked up by the retina.
Or is there a different mechanism at work with respect to the South Atlantic anomaly?