I am unfortunately a new migraine sufferer and am still learning about them. I have about 1 - 2 a month but have noticed that I see a change in my vision before the headache comes on. The best way to explain it is that the lights look like they have a glare, such as if you have been crying and your eyes are wet and looking at lights caused glares. And then I have a headache for 2-3 days and then the light issues are still there for sometimes up to 48 hours. Is this common?