胡萝卜能提高视力？我们对视力的15个误解
Do carrots improve your vision? 15 misconceptions about your eyesight
We can probably all recount at least a dozen weird and alarming things parents, teachers, and older siblings told us about our eyes when we were kids. For instance, we'd be permanently cross-eyed if we didn't stop making those faces at our brother or we'd go blind from reading in the dark. But maybe, just maybe, we could find redemption by eating lots of carrots. Here are a few common myths and misconceptions.
我们都能回忆起自己小时候,父母、老师和哥哥姐姐们曾经告诉过我们的那些有关视力怪异又吓人的事情.比如,如果我们再继续向哥哥扮鬼脸,以后就会变成斗鸡眼,又或者在黑暗中阅读眼睛会瞎掉.但是,如果我们吃很多很多的胡萝卜,也许我们的眼睛还有救.以下就是关于视力的几个常见的误解和迷思.
MYTH #1: IF YOU CROSS YOUR EYES, THEY'LL STAY THAT WAY.
误解1：如果你装成斗鸡眼,那么你将一直是斗鸡眼
Crossed eyes occur when your eyes don't look the same way at the same time. There are six muscles attached to each of our eyes that, guided by signals from the brain, control their movements. When your eyes don't align, the brain gets two different images. Over time, this can cause more serious vision issues. That's a real problem, but it's not caused by making your eyes cross on purpose for short periods of time.
斗鸡眼只有在你的两只眼睛没有同时看向同一个方向的时候才会出现.我们的每只眼睛周围有六块肌肉,它们由大脑中的信号控制.你的两只眼睛若是没有对齐,那么你的大脑就会得到两幅不同的图像.随着时间的流逝,这会造成更加严重的视力问题.不过你短暂地装一下斗鸡眼并不能达到这种效果.
MYTH #2. EATING CARROTS WILL HELP YOU SEE IN THE DARK.
误解2：吃胡萝卜能增强你的夜间视力
Well, carrots certainly aren't bad for your eyesight. They contain plenty of beta-carotene, which your body converts into vitamin A, a crucial vitamin for vision. But carrots don't do anything exceptional for your nighttime vision.
其实胡萝卜对你的视力没有坏处,它们含有丰富的β-胡萝卜素,随后你的身体会将它们变成维他命A,这种维他命对视力至关重要.但胡萝卜无法让你的夜间视力变得超常.
MYTH #3: THE BIGGER YOUR EYES, THE BETTER YOUR EYESIGHT.
误解3：你的眼睛越大,视力越好.
When you're born, your eyeballs are approximately 16 millimeters in diameter, reaching 24 millimeters as an adult. But your eyes getting larger does not necessarily mean that your vision is getting better. In fact, excessive growth in human eyes can cause myopia, or nearsightedness. If the eyeball is too long, the eye's lens can't focus the light in the right part of the retina to process images clearly.
人类刚出生的时候,眼球直径约为16毫米,成年后会达到24毫米.但你的眼睛变大了并不意味着你的视力变强了.事实上,人类眼睛过度增长会造成近视.如果眼球太长,那么眼睛的晶状体就无法将光线聚集在视网膜的正确位置,人类也无法接收到清晰的图像.
