Could be many things.. Might make sense to visit the doc. I remember having those back in the day and i had a severe eye infection and astigmatism.
Better safe than sorry right.
My father had blury vision and it turned out he had diabetes. Not saying that is the case here, just pointint out that ignoring it can be fatal. Honestly if you have major vision problems (like you are claiming right now) you should go get checked out by an eye doctor.
Besides, you really can't game or watch too much TV. I've done 24hr gaming sessions before (and I'm sure others have done longer) with no vision problems other than tired eyes. Now, maybe if you'd claimed you've gone a week on 2hrs of sleep per night, then I'd just tell you to get good sleep.