Your blurred vision may caused by migraine. In fact, migraine is a type of headache caused by acomplex interactions between the nervous system and the vascular system. And it can cause some visual disturbances. So, it is normal if you feel blurred vision, flickering lights, zigzag lines and even temporary blindness. So, what you shall do right now it treat your migraine immediately.
It is the migraine that cause the blurred vision. Although migraine is a diseases that cause headaches. But it can also cause some vision problems such as blurred vision. So, don't worry, as long as you cure your migraine, the blurred vision will go away. Good luck.