Ocular migraine is migraine which comes with visual symptoms and often without a headache. The question is how would you know you have ocular migraine if you don't even have a headache?
The main symptom of ocular migraine is distortion of images as you look of them. The distortion often begins at the center of the image, moving to a particular side. Ocular migraine usually occurs to one eye at a time. Find out more about it through the site at http://psychology.wikia.com/wiki/Neurology. During an episode, images could look grey or may be wavy. Some people actually lose their sight during an attack, but not permanently.
Ocular migraine may occur in young adults as well as in elderly people. In any case, the symptoms are mostly the same. For example, if you have this condition, you may see holes in your field of vision. If you were looking at a picture, you would see the sides but not the middle. Or if you're watching TV, you would see the frame of the screen but not the center. When you close the affected eye though, you will have normal vision. Another symptom of ocular migraine is when you see everything like they were hidden behind a gray fabric, or as though you were looking through a window in heavy rain. Again, that effect will only be limited to the affected eye, so if you close it, you will be able to see normally.
The good news is, even if you have optical migraine from time to time, all these symptoms are temporary and do not cause any long-term damage to your eyes. But of course, they can still interfere with activities you do from day to day, like driving or typing on the computer. So if ever you need to treat migraine, it would be wise for you to consult a professional.
If you're asking what the causes of ocular migraine are, it depends on the symptom itself. For example, temporary blindness often results from inadequate blood flow to the affected eye, and the symptoms may be a result of a blockage in an artery that leads to it. For all others, there can be many different causes, like spasms in the artery that delivers blood to the retina, blood vessel inflammation, sickle cell disease and other conditions that promote abnormal blood clotting, and even drug abuse.
If you think you have ocular migraine, it's always best to see your doctor at the soonest time for migraine cures. This professional can give you the best recommendations as to how to deal with the condition, especially in terms of prevention.