My wife and I usually reserve Sundays to crash. She wanted to take a nap and I was not tired so I decided to play Lumines on my PSP. The time was about 4:00 and it was moderately dark in the room. I quit playing at 5:30 and got up to go to my office and read my email. Before I left the bedroom I turned to look at the time on my wife's clock and noticed it was blurry. I started to stare at it and I could not focus. I went into my office and notice that the icons on my computer were blurry. I have perfect vision, I do not use glasses or contacts and I feel if tested my eyesight would measure better than 20/20. All of a sudden my vision was slightly blurred and I started freaking out. By 6:30 and having my eyes shut for a while my vision has returned to normal. I wanted to share this so that you and your kids can beware and not permanently lose your vision. I am going to have a carrot now.