So why do parents the world over still say this to their kids? Surprisingly, there was actually a very brief period of time where sitting close to the TV could damage your eyes, assuming you owned a General ElectricTV in the 1960s. Specifically, in 1967, General Electric informed the public that many of their color televisions were emitting excessive x-rays due to a "factory error". GE fixed this problem by putting a leaded glass shield around the tubes.
Health officials at the time estimated that the amount of radiation being given off by these defective TVs was about 10 to 100,000 times higher than the rate considered acceptable. They recommended, if you owned one of these TVs, not to sit too close. As long as you were a few feet away and didn't watch TV for more than an hour at a time or so at this close range, you were problem fine. General Electric of course recalled all these TV's and fixed the problem, so the issue went away
* Looking up at the TV with your head tilted up,such as when kids lay on the floor watching TV, will cause more eyestrain than if you are looking straight on at the TV or it is below you so you are looking down at it. The same applies for computer monitors.
* Another cause of extra eyestrain is watching TV or looking at a computerscreen where the light level of the screen is very different than the light level of the surrounding environment.
* Eyestrain is not a serious problem. The "cure" is simply to give your eyes a break from focusing on a specific thing for extended periods and it will more or less go away.
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