They started several days ago with a black flashing line. I went to my optometrist who thought they might be migraine related. But I have never had anything limethat before with a migraine. Now I am getting pulses of light flashing on the side of one eye. I know that chances are it is just a vitreous thing, although my dr. couldnt see anythng wrong. I made a mistake of googling and saw stories of brain tumour patients who died and flashing lights and lines were their first signs. Really freaking out now.