What is an ocular migraine?
An ocular migraine is a temporary problem with your vision that is usually, but not always, painless. You may lose some of your vision for a few minutes. You may see colors, zigzags of light, and bright spots or lines that float slowly across your field of vision. Ocular migraines are almost always harmless, but need to be checked urgently and thoroughly to rule out other, more dangerous reasons for the visual disturbances.