The answer is yes certainly, staring at a computer for such a long time can give rise to bad vision obviously. From the scientific point, the people who star at a computer are easier to have vision problems compared with others, which means, the longer they get in touch with computer, the more possible their eyes will be harmful due to a long time radiation. In addition, it will make your eyes stress and also have the dry eyes. There is a professional explanation, too many radiations are absolutely damage to our eyes, and will give rise to the changes of our retina's radian. Accordingly, as far as i am concerned, it's totally no problems to enjoy your free time, but moderating in the time is also necessary for the sake of your eyes. Just do eye exercise every day and have eye check regularly.