Watching television occasionally is harmless to eyesight, and the radiation from TV sets is negligible.

When television became a household fixture in the early 1950s, guidance on its health effects was sparse and often contradictory. Parents were told not to let children sit too close, but the reason for this advice was vague, something about eyestrain, perhaps. The sets themselves were large wooden cabinets enclosing cathode-ray tubes, humming with high-voltage electricity. The idea that these devices might be producing something beyond visible light and sound would not enter mainstream awareness until a product recall made it impossible to ignore.

In 1967, General Electric recalled approximately 90,000 color television sets after it was discovered they were emitting X-ray radiation at levels up to 100,000 times the acceptable safety limit. The fault was a specific voltage regulator tube in early GE color sets that, when it malfunctioned, allowed the picture tube to operate at excessive voltages, producing X-rays that penetrated the set's cabinet. GE had known about the problem for months before the recall. The Consumer Product Safety Commission did not yet exist; it would not be established until 1972.

The 1967 recall prompted the Radiation Control for Health and Safety Act of 1968, which established federal authority to set emission standards for electronic products. Manufacturers responded by shielding sets adequately. By the early 1970s, X-ray emissions from television sets had been reduced to negligible levels through redesign and regulation.

The health question did not go away, however; it simply changed form. As CRT televisions gave way to LCD and LED screens, concern shifted from ionizing radiation to non-ionizing blue light. Research has found that high-intensity blue light exposure in the hours before sleep can suppress melatonin production and disrupt circadian rhythm. Pediatric ophthalmologists have documented correlations between screen time and myopia progression in children, though the precise mechanism, whether it is near-work, reduced outdoor time, or light spectrum, remains an active research question.

The original concern about television and eyestrain, dismissed in the 1950s as overprotective parental anxiety, turned out to be asking the right question about the wrong mechanism. CRT radiation was briefly a real hazard, quickly engineered away. The screen-time and vision questions raised by modern research suggest that watching screens, of any type, does have effects on eyes and sleep that the confident safety assurances of 1955 could not have anticipated.