双语阅览近视的人老了今后视力会变好吗

假如说年轻时近视的咱们，老了之后会远视，那么，是不是会有那么一段时刻，咱们的视力能好到看清视力表最下面那一排“鬼画符”呢？

答案是：不一定。

事实是这样的：

Babies are actually farsighted, and as they grow older their eyes grow too until they reach a point of "perfect" eyesight, called emmetropia.

刚出世的婴儿都是远视眼，但跟着年纪添加，眼睛也会发育，直到“视力正常”，学术上叫做“屈光正常”（emmetropia）。

出世的时分，婴儿都相同，都是远视眼。等渐渐长大，儿童的视力就正常了。但许多人青春期长着长着就过了那个点，变成了近视。

It isn't entirely worked out what cues the eye that it is time to stop growing, but we know that in many kids the eye continues to grow past emmetropia and they become nearsighted.

其实直到现在（科学家）也还没有彻底弄清楚是什么要素“告知”眼睛该中止发育了。但咱们咱们都知道，许多孩子的眼睛在视力正常后持续发育，成果变成了近视。

Basically, when the eye grows too long the light inside the eye comes to a focus in front of the retina rather than at the retina, causing blurry vision, so we must wear glasses to change the optics and focus the light onto the retina again.

是这样的，假如眼睛的前后间隔太长，眼睛里的光线就会聚集在视网膜前面而不是视网膜上，然后造成了含糊的视觉，因而，咱们一定要戴上眼镜来改动光线的途径，使它再次聚集到视网膜上。

When we age, we suffer a different process. Our tissues become stiffer and the lens doesn't adjust as easily so we start to lose near vision as well.

跟着年纪添加，咱们会阅历一个不同的进程。咱们的眼部安排会变得生硬，晶状体的活动性也变差，渐渐地，咱们就连近的东西也看不清了。

比及老了，认为远视能够把它拉回来，却发现晶状体现已失去了弹性，近视远视并存，需求两幅眼镜了。

Many older folks must wear bifocals which have two different lenses- one to correct for the problems with near vision and one to correct for problems with far vision.

许多老年人有必要佩带有两种不同镜片的双焦眼镜，一种用于纠正近视问题，另一种用于纠正远视问题。

环顾四周，想想看，你身边戴眼镜的人占多大比重？

事实上，我国青年的近视问题早就见诸世界媒体的报端。

本年四月份，China Daily就曾报导过学生的近视问题：

More than half the young children and teenagers in China are nearsighted, according to a survey by top government agencies, which called for intensified efforts to prevent and control the condition.

有关部门的一项研讨显现，我国有一半以上的儿童和青少年是近视眼，该研讨呼吁加大防备和操控近视的力度。

The survey, which was conducted last year, found that eight of 10 senior middle school students were nearsighted, compared with 71.6 percent in junior middle school, 36 percent in primary school and 14 percent of 6-year-olds in kindergarten. Overall, 53.6 percent were nearsighted.

上一年进行的这项研讨发现，10名高中生中有8人近视，而初中生近视率为71.6%，小学生近视率为36%，幼儿园6岁儿童近视率为14%。总的来看，也有53.6%的人患有近视。

The prevalence of a high degree of myopia also became alarming as the percentage of senior students in high school, who wear glasses stronger than six diopters, has mounted to 21.9 percent.新华社的同期报导也显现，高中生近视人群中高度近视的人数也有明显添加。

高度近视的患病率也令人担忧——高中生中戴着600度以上近视眼镜的份额现已上升到了21.9%

Up to 80 percent of the country’s young adults suffer from nearsightedness, according to a report in the medical journal Lancet. In contrast, the overall rate of myopia in the UK is about 20-30 percent.威望医学杂志《柳叶刀》在2018年的一项针对我国青年集体的研讨中发现：

医学杂志《柳叶刀》的一项陈述数据显现，（我国）80%的年轻人患有近视。比较之下，英国的近视率大约为20%-30%。

If you walk the streets of China today, you'll quickly notice that most young people wear glasses. In Shanghai, for instance, 86 percent of high school students suffer from myopia, or nearsightedness, according to Xinhua News Agency.早在2015年，美国国家公共电台引述新华社报导的数字称其时就有86%的高中生患有近视了：

走在现在的我国街头，你会很快注意到大多数年轻人都戴着眼镜。

相似的数字还被《每日电讯报》、半岛电视台和石英网等新闻媒体报导过。

之后，2017年《南华早报》的报导引述了《柳叶刀》的一项研讨显现：青少年大范围近视不单单是我国一个国家的问题，是整个东亚区域的问题。

The growing prevalence of myopia is not only a Chinese problem, but it is an especially East Asian one. According to a study published in The Lancet medical journal in 2012, by Ian Morgan, of the Australian National University, South Korea leads the pack, with 96 percent of young adults (below the age 20) having myopia; and the rate for Seoul is even higher. In Singapore, the figure is 82 percent.

近视患病率的不断上升不仅是我国一个国家的问题，而是困扰整个东亚的问题。澳大利亚国立大学的伊恩·摩根2012年在《柳叶刀》上宣布的一项研讨显现，韩国的近视率高居榜首，96%的年轻人（20岁以下）患有近视，首尔的近视率乃至更高。新加坡的这个数字是82%。

近视的原因究竟是什么？ZME Science的标题更是吓人：To say that Asia is having an eye problem is an understatement.说是“亚洲近视”都不为过。

China Daily的报导总结了近视的几大原因：

Several factors are associated with the high rate of nearsightedness in China's children and teenagers, including lack of outdoor physical activity, lack of adequate sleep due to heavy extracurricular work and excessive use of electronics products.

有若干个要素与我国儿童和青少年近视率高有关，包含缺少野外体育活动、课余作业深重导致睡觉不足，以及过度运用电子科技类产品。

书本拿太近，电子科技类产品用太多现已是陈词滥调了。但宣布在威望杂志《眼科》上的一项研讨显现野外活动的确是一个首要的要素：久坐不出门、睡觉少、看手机多，这说的不就是我吗？

Biologists compared Singaporeans living in Singapore to those living in Australia. They found that 29 percent of the Singaporean students had myopia compared with just 3 percent in Sydney. The main correlation was once again, time spent outside.

生物学家把居住在新加坡的新加坡人与居住在澳大利亚的新加坡人作了比较。他们发现29%的新加坡学生患有近视，而在悉尼的那一组中就只要3%。首要的相关再次出现在花在野外的时刻上。

“The big difference was the Chinese children in Australia were outdoors a lot more than their matched peers in Singapore,” says Ian Morgan, a retired biologist at Australian National University, who coauthored the 2008 study. “This was the only thing that fit with the huge difference in prevalence.”

澳大利亚国立大学退休生物学家伊恩·摩根表明：“两组之间最大的不同在于，与新加坡的同龄人比较，澳大利亚的华裔在野外活动的时刻多得多。这也是仅有能解说近视率巨大差异的要素。”