Counters showcasing anti-blue-light glasses have started popping up in opticians all over China. The nation’s top ophthalmologists, however, say there is no scientific basis for such offering any benefit to those spending long periods of time looking at screens.
中国各地的眼镜店都开始出现展示防蓝光眼镜的专柜。然而，美国顶级眼科医生表示，没有科学依据表明这种做法对那些长时间看屏幕的人有任何好处。
Hazards to grandchildren are a favourite topic for older Chinese women in their lecturing of their children. As the young ones spend more and more time looking at screens, so the amplification of gossip has led to the widespread belief that blue light causes blindness.
对孙辈的危害是中国老年妇女在给孩子们讲课时最喜欢的话题。随着年轻人花越来越多的时间看屏幕，八卦的放大导致人们普遍认为蓝光会导致失明。
“Online class partner to relieve visual fatigue” is one of the many advertising slogans for anti-blue ray glasses that have appeared in recent weeks. They claim to be able to “block 95 percent of blue light” or “effectively prevent myopia”. Naturally some command high prices, being allegedly imported from the United States, Germany or Japan.
“网课伴侣，缓解视疲劳”是近几周出现的众多防蓝光眼镜广告语之一。他们声称能够“阻挡95%的蓝光”或“有效预防近视”。当然，有些价格很高，据称是从美国、德国或日本进口的。
The wavelength of blue light is in the range of 380-500 nanometres. Its primary source is sunlight, while others include fluorescent lamps and LED screens. Far from being anything to fear, the intensity of blue light from a smartphone screen is only one hundredth or even one thousandth that in natural light.
蓝光的波长在380-500纳米范围内。它的主要来源是阳光，其他来源包括荧光灯和 LED 屏幕。完全不用担心，智能手机屏幕发出的蓝光强度仅为自然光的百分之一甚至千分之一。
For anyone who does not work in a strong blue-light environment, such as on an ocean surface, near icebergs and/or snow all year round, or those who use a computer for less than 10 hours a day, including minors who are online students, blue light is nothing to worry about.
对于不在强蓝光环境下工作的人，例如常年在海面、冰山和/或雪地附近工作的人，或每天使用电脑时间少于 10 小时的人，包括未成年人上网的学生，蓝光无需担心。
Results from tests conducted previously by the China Consumers Association on a representative range of electronic products also show that blue-light values are within the safe range.
中国消费者协会此前对部分代表性电子产品进行的测试结果也显示蓝光值在安全范围内。
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It may not come as a surprise that a number of lens manufacturers have revealed that the claim, “Blocks 100 percent of blue light”, is more than a lie. The president of a prominent local lens producer told reporters for The Paper that many of their competitors claim to sell “foreign brand” anti-blue light glasses which are actually produced in China.
许多镜片制造商透露，“阻挡 100% 蓝光”的说法不仅仅是谎言，这可能并不令人意外。当地一家知名镜片生产商的总裁告诉澎湃新闻记者，他们的许多竞争对手声称销售“洋品牌”防蓝光眼镜，但实际上是在中国生产的。
The president also pointed out that these types of lenses often block the beneficial part of blue light as well. For minors still in the stage of development, long-term wear of such anti-blue ray glasses may result in vision loss and damage to biological rhythms.
总统还指出，这些类型的镜片通常也会阻挡蓝光的有益部分。 For minors still in the stage of development, long-term wear of such anti-blue ray glasses may result in vision loss and damage to biological rhythms.
Chen Zhijun, Director of the Department of Ophthalmology in Nanjing Children’s Hospital, said, “Excessive interception of blue light affects melatonin secretion and interferes with sleep”.
南京儿童医院眼科主任陈志军表示，“过多的蓝光拦截会影响褪黑激素的分泌，干扰睡眠”。
The fact is, China has had a high rate of myopia since long before the advent of the smartphone.
事实上，早在智能手机出现之前，中国的近视率就很高。
The rate of myopia in China is, in fact, so skewed that it is one and a half times more than the world average; 33 percent versus 22 percent.
事实上，中国的近视率非常严重，是世界平均水平的一倍半； 33% 对 22%。
As long ago as 2017, this very publication published a growing body of evidence that suggests the large occurrence rate may, in fact, have little to do with study or smartphones, and be more down to the fact that many Chinese spend long periods indoors in poor lighting conditions.
早在 2017 年，这家出版物就发表了越来越多的证据，表明这种现象的发生率实际上可能与学习或智能手机无关，而更多地归因于许多中国人长时间呆在室内照明条件不佳的情况下。
Professor Ian Morgan, of the Research School of Biology, Australian National University, Canberra, and the Zhongshan Ophthalmic Centre, Sun Yat-sen University, Guangzhou, spoke at length with The Nanjinger at the time. His epidemiological studies estimate children should spend approximately 3 hours each day in sunlight in order to be protected against myopia.
堪培拉澳大利亚国立大学生物研究院和广州中山大学中山眼科中心的伊恩·摩根教授当时接受了《南京人》的详细采访。他的流行病学研究估计，儿童每天应该在阳光下呆大约 3 小时，才能预防近视。
Chen agrees with Morgan. “Instead of wearing anti-blue light glasses, it is better to bathe in the sun for 2 hours a day”, he said.
陈同意摩根的观点。 “与其戴防蓝光眼镜，不如每天沐浴2小时阳光”，他说。
With children spending much of this year to date tackling online learning, the “Guidelines on the Prevention of Myopia during the Novel Corona Pneumonia Outbreak in Children and Adolescents (Updated Version)” proposes that children and adolescents choose electronic products with large screens, high screen resolutions and suitable definitions as much as possible. During use, they should adjust the brightness to make the eyes feel comfortable; not too bright or too dark.
今年以来，孩子们大部分时间都在网上学习，《新冠肺炎疫情期间儿童青少年预防近视指南（更新版）》提出，儿童青少年尽可能选择大屏幕、高屏幕分辨率、清晰度合适的电子产品。使用时应调节亮度，使眼睛感觉舒适；不要太亮或太暗。
Wei Wenbin is Director of the Department of Ophthalmology in Beijing Tongren Hospital. He advocates a “20-20-20” formula for the use of electronic products. After looking at a screen for 20 minutes, look away at something else that is at least 20 feet (6 metres) away for more than 20 seconds.
魏文斌，北京同仁医院眼科主任。他提倡电子产品的使用“20-20-20”公式。看屏幕 20 分钟后，将目光移开至少 20 英尺（6 米）以外的其他物体 20 秒以上。
