That is just what MY eye doctor was watching for in ME!!!
I had gone to him for another problem, and he discovered a fair amount of pressure in MY eyes, and decided to watch for that problem.
I told him about the flashing curves and he told me they were 'migraines', showed me their picture in a book, and attached no other significance to them.
They have since stopped occurring...probably due to closer attention to my diet.
To know more about YOUR eyes, check with an eye specialist, please.