I usually spend around 5 hours a day on a computer, and lately I've been reading about eye strain. Will I develop eye strain and how bad is it?
With eye strain it depends how badly you've strained your eyes and how frequently it is.
Once you get eye strain if you don't take a real break and get over it properly it tends to get worse.
A tip for you. When watching television, it may be easier on your eyes if you keep the room softly lit.
Check some of the most common symptoms of computer eye strain: