Hello , I have been facing this issue from childhood. Whenever I do any physical activity like running, walking fast, playing cricket, trekking etc suddenly zig Zag lines start coming in front of my eyes, then shortly those lines become large and blinking of those lines become more intense, then I can not see clearly with eyes , I see darkness with those zig Zag lines , and then starts headache and vomiting also sometimes. Can anybody tell what is this and is there treatment for this. Thanks in advance.