Thanks very much for the answers.The problem is that she has other serious health issues and she is getting to breaking point mentally and feels that she can't take any more.She is absolutely petrified of going to the eye clinic in 2 weeks time for a check up,in fact,I don't know if I'll manage to get her there.She keeps saying that she isn't going and I can't force her to go.
I had that this last month, along with floaters, turned out the vitreous gel had separated from retina, now recovering from 3rd surgery, 1st two were laser, and they didnt work, had major microsurgery the 3rd time, and retina reattached itself with a fold in it, my vision is now permanently distorted, I would advise she get to her eye doctor asap, as i waited three days before i saw mine, if i would have got in right away, laser treatment would have fixed it, Good Luck
This type of flash is usually due to vitreous traction. You need to have it checked by your doctor.
Dr. O.