Can your vision become blurred 24/7 from 9 hrs a day on the computer?

I admit to doing it. But I have business to attend to, among other more social things on my computer. The last few months my vision has become blurry. Worse than ever in my life. I have no headaches, No trouble driving but I was dizzy one day last week. I attributed it to taking a blue sleep gel plus Melatonin before bed and won’t do that again.