Sitting too close to a TV set?

Discussion in 'Optometry Archives' started by Opticreep, May 2, 2004.

  1. Opticreep

    Opticreep Guest

    Would sitting too close to a 20" flat screen TV be harmful to the
    eyes?

    When I was a kid, I was told to stay at least six feet away from the
    TV set. I think it was because of radiation or somesuch. However, I
    think newer TV sets from the past decade or so are shielded from
    radiation.

    So is there any reason why a person shouldn't sit 3 feet in front of a
    small TV screen these days? My kids play video games 3 feet away from
    the 20" TV set. They don't mind seeing the pixelations of a low-res
    TV screen. Anyway, I'm not 100% comfortable with that short viewing
    distance, but I can't find a good explanation why it's bad for them.
    They tell me that I sit closer to my 19" computer monitor than they do
    to the 20" TV screen.
     
    Opticreep, May 2, 2004
    #1
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  2. Opticreep

    Mark A Guest

    If the screen image is relatively sharp, it should not be a problem. The
    smaller the set, the closer you can view it comfortably. TV sets are not as
    well shielded as computer monitors, but 3 feet in front of the set should
    not be a problem. Most of the problem is typically in the rear or underneath
    the TV set.
     
    Mark A, May 2, 2004
    #2
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  3. Opticreep

    Otis Brown Guest

    Dear Opticreep,

    An accellerated electron striking a surface creates electro-magnetic
    radiation. It has been understood that "soft" X-rays are
    created close to the surface of a CRT face. The greater
    the voltage "drop" the more energetic the X-Rays.

    The old black-and-white sets had about 14K volts drop.

    The color had about 24K. Provided you do not put
    you nose on the CRT there is only a very low risk.

    Best,

    Otis
    Engineer
     
    Otis Brown, May 2, 2004
    #3
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