I always liked sitting close to the TV set. That was before giant flat screens were available. There is no direct evidence, however, that sitting close  to the TV monitor harms your eyes. It may be a sign, though, that you are near sighted and should see an eye doctor.

Reading under dim light is not dangerous either, but expect to feel some eye strain. Also, staring at a computer for a long period of time (in which i always did) when surfing or playing video games will dehydrate your eyes and cause eye fatigue. That’s because our eyes blink less. So every once in a while, give your eyes a break. Glance up, gaze across the room and look far-away objects. Every 20 minutes would be good interval.