A decade into her optometry career, Marina Su began noticing something unusual about the kids in her New York City practice. More of them were requiring glasses, and at younger and younger ages. Many of these kids had parents who had perfect vision and who were baffled by the decline in their children's eyesight. Frankly, Su couldn't explain it either.
In optometry school, she had been taught-as American textbooks had been teaching for decades-that nearsightedness, or myopia, is a genetic condition. Having one parent with myopia doubles the odds that a kid will need glasses. Having two parents with myopia quintuples them. Over the years, she did indeed diagnose lots of nearsighted kids with nearsighted parents. These parents, she told me, would sigh in recognition: Oh no, not them too. But something was changing. A generation of children was suddenly seeing worse than their parents. Su remembers asking herself, as she saw more and more young patients with bad eyesight that seemed to have come out of nowhere: "If it's only genetics, then why are these kids also getting myopic?"
What she noticed in her New York office a few years ago has in fact been happening around the world. In East and Southeast Asia, where this shift is most dramatic, the proportion of teenagers and young adults with myopia has jumped from roughly a quarter to more than 80 percent in just over half a century. In China, myopia is so prevalent that it has become a national-security concern: The military is worried about recruiting enough sharp-eyed pilots from among the country's 1.4 billion people. Recent pandemic lockdowns seem to have made eyesight among Chinese children even worse.
この記事は The Atlantic の October 2022 版に掲載されています。
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この記事は The Atlantic の October 2022 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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