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.
What Causes Ocular Migraines. A migraine that involves visual disturbance is called an ocular migraine. Ocular migraines can develop with or without the accompanying pain of a classic migraine. During an ocular migraine, or migraine with aura, you may see flashing or shimmering lights, zigzagging lines, or stars. Some people describe psychedelic images. It may also cause blind spots in your field of vision. Of people who report having migraines, one out of every five experiences this aura (Womenshealth.gov, 2012). Ocular migraines can interfere with your ability to perform tasks like reading, writing, or driving.