With SVG we can add a clipping path to change the shape of our images. First we open a SVG tag with namespaced href attribute and namespace definition: <svg class=svg-graphic width=180 height=200 viewBox=0 0 560 645 xmlns=http://www.w3.org/2000/svg xlink=http://www.w3.org/1999/xlink version=1.1>.
Just as with other types of migraine, the underlying cause for migraines with visual symptoms have not been definitively established. Many researchers believe that these symptoms are caused by a short-lived reduction in blood flow, which might be caused by a spasm in the blood vessels.
The cause of migraine with aura isn't clearly understood. It's believed that the migraine with visual aura is like an electrical or chemical wave that moves across the part of your brain that processes visual signals (visual cortex) and causes these visual hallucinations.