I have been playin soccer since I was 5 and I am now 25. The other day while playin, my vision got very blury when my heatrate went up, when i subed out and sat on the beanch for a few min and allowed my heartrate to come back down, my vision came back, but it then again went quickly away when my heartrate went but up? Im not sure what is going on.. I am very health and havent changed my diet or anything that I can think of..... I lookin for some help.... Dr has not said anything is wrong. ? %-)