Why the old warning took hold
The advice to back away from the television has a real historical hook: a small number of General Electric color sets from the 1960s emitted harmful radiation because of a defect. They were recalled. But that was a problem with particular machines—not a harmful effect caused by watching a screen from nearby.
That distinction matters. Radiation from a faulty set was an equipment-safety issue; distance from an ordinary television was not the cause of it. The recall gave families a memorable reason to connect television and eye danger, even though the two concerns were different.
What sitting close can actually do
A nearby screen can make the eyes work harder temporarily. To keep a close image clear, the eye’s focusing system adjusts, and people may blink less while concentrating. After a long stretch, that can contribute to tired eyes, dryness, or a headache. These effects are generally temporary; they are not the same as permanent damage from proximity.
The same kind of discomfort can happen when reading a book held close or staring at any screen for a long time. Taking breaks, blinking, and moving the screen to a comfortable distance can help if viewing feels tiring. The distance may affect comfort, but sitting close to a functioning TV does not, by itself, ruin eyesight.
