Researchers in two different studies compared children who had slept with nightlights in their rooms as infants to children who had not. In the first study, the children who had slept with night-lights proved more likely to be farsighted, but the second study found negligible correlation between farsightedness and night-lights. Admittedly, the children in the first study were younger than those in the second one. Thus, if night-lights cause farsightedness, the effect disappears with age.
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