When i was younger i used to spin around in circles A LOT becuase i liked seeing the house spin but one day i fell down and hit the back of my head really hard. And things blurred up and got all weird since then at random times sometimes things will just blurr up and i cant focus cuz im dissy. Im sure the two have nothing related. but your not alone that happens to a lot of people i know. Just dont stay on the computer when that happen and rest your eye instead of staring at the screen. if it happens a lot go to the docter.