Does staring at a computer screen too much have any negative effects on your eye sight? Reason I ask is because the other day I went to get my license renewed, and found out I had 20/60 vision in my left eye, when a year ago it was 20/20 or 20/30. In the past year I have been spending much more time on the computer, maybe 2 hours daily on weekdays, and up to 4 or 5 hours daily on weekends, but could this really be whats causing my eye sight to get worse?