FactSentinel

Reading in dim light or sitting close to a television does not cause permanent blindness. Major ophthalmology organizations, including the American Academy of Ophthalmology, state that these habits do not damage the structure of the eye or cause lasting vision loss. The eye is built to function across a wide range of lighting conditions, and the muscles and tissues involved in focusing are not harmed by temporary strain.

What people experience in these situations is real but short-lived. Reading in low light or staring at a screen for long stretches can cause eye fatigue, dryness, headaches, and blurred vision, a cluster of symptoms often called digital eye strain or asthenopia. People also blink less while concentrating, which dries the surface of the eye. These symptoms typically fade after resting the eyes, and they do not indicate injury to the retina, optic nerve, or lens.

The myth likely persists because of older warnings from parents and the fact that children often sit close to screens. In many cases, a child who sits very near the TV simply has nearsightedness (myopia) and is trying to see more clearly, so the behavior is a sign of the condition rather than its cause. Children can also focus comfortably at close distances that adults cannot. Still, frequent squinting or sitting very close can signal a need for an eye exam. Genetics and limited time outdoors are far better established risk factors for myopia than reading light or screen distance.