I've had major flashes of light occuring in one of my eyes for the last couple months. Went to the eye doctor who told me nothings wrong. I got a 2nd opinion and he told me nothings wrong. I went to my normal doctor who told me it's probably a migraine. But I don't have a headache with the flashing. and also it's pretty much all the time. I went to another doctor who made me do one of those MRI things and he said there's nothing wrong. I really can't concentrate with it. What should I do now?