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Do Screens Harm Eyesight
Screens do not usually cause permanent vision loss in adults, but they can lead to dry eyes and temporary blurred vision because of reduced blinking and visual strain. The 20-20-20 rule can ease symptoms as long as it is followed consistently, though there is no evidence that it has a lasting effect. Blue-light-blocking glasses have also not been proven effective. In children, longer screen use is associated with nearsightedness: each additional hour per day has been linked to a 21% increase in the odds of developing it, with risk rising noticeably between one and four hours. The article recommends limiting prolonged close-up work and ensuring children spend at least two hours outdoors each day, as well as getting vision screenings and correcting any problems.
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