Ok so i really haven't played outside alot. Like really not much outdoor excersice or any kind of excersice at all. Well i was playing some soccer with my friends and suddenly im breathing hard and tired. I expected that i would be out of shape. But then my vision becomes kinda blurry. Almost undefined. Like all the colors were green but different shades of green. Ex: Black and white pictures have a contrast of black and white but my vision was a contrast of light green to dark green. I wasn't hurt, i felt good later. I had a sick headache though. Any idea what this could have been? Thanks a lot guys and gals. = ]