85 Eye Facts

There are many commonly held beliefs about eyeglasses and eyesight that are not proven facts. For instance, some people believe that wearing glasses too soon weakens the eyes. But there is no evidence to show that the structure of eyes is changed by wearing glasses at a young age. Wearing the wrong glasses, however, can prove harmful. Studies show that for adults there is no danger, but children can develop loss of vision if they have glasses inappropriate for their eyes.

We have all heard some of the common myths about how eyesight gets bad. Most people believe that reading in dim light causes poor eyesight, but that is untrue. Too little light makes the eyes work harder, so they do get tired and strained. Eyestrain also results from reading a lot, reading in bed, and watching too much television. However, although eyestrain may cause some pain or headaches, it does not permanently damage eyesight.

Another myth about eyes is that they can be replaced, or transferred from one person to another. There are close to one million nerve fibers that connect the eyeball to the brain; as of yet, it is impossible to attach them all in a new person. Only certain parts of the eye—the cornea and the retina—can be replaced. But if we keep clearing up the myths and learning more about the eyes, someday a full transplant may be possible!

85 眼睛的真相

关于眼镜和视力，有很多普遍的看法并不是已证实的事实。例如，有些人认为过早戴眼镜会让眼睛变弱，但没有证据表明年轻时戴眼镜会改变眼睛的结构。不过，戴错眼镜可能是有害的。研究表明，这对成年人没有危险，但如果儿童戴了不适合自己眼睛的眼镜，可能会出现视力下降。

我们都听过一些关于视力变差的常见误区。大多数人认为在昏暗的光线下阅读会导致视力变差，但这是不正确的。光线太暗会让眼睛更费力，所以会感到疲劳和紧张。长时间阅读、在床上阅读以及看太多电视也会导致眼疲劳。不过，虽然眼疲劳可能会引起一些疼痛或头痛，但它不会永久损害视力。

另一个关于眼睛的误区是眼睛可以被替换，或者从一个人移植到另一个人身上。眼球和大脑之间有近一百万条神经纤维相连；到目前为止，还不可能把所有这些神经纤维都连接到另一个人身上。只有眼睛的某些部分——角膜和视网膜——可以被替换。但如果我们继续澄清这些误区，更多地了解眼睛，也许有一天完整的眼睛移植会成为可能！