胡蘿卜能提高視力？我們對視力的15個誤解
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.
我們都能回憶起自己小時候,父母、老師和哥哥姐姐們曾經告訴過我們的那些有關視力怪異又嚇人的事情.比如,如果我們再繼續向哥哥扮鬼臉,以后就會變成斗雞眼,又或者在黑暗中閱讀眼睛會瞎掉.但是,如果我們吃很多很多的胡蘿卜,也許我們的眼睛還有救.以下就是關于視力的幾個常見的誤解和迷思.
MYTH #1: IF YOU CROSS YOUR EYES, THEY'LL STAY THAT WAY.
誤解1：如果你裝成斗雞眼,那么你將一直是斗雞眼
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.
斗雞眼只有在你的兩只眼睛沒有同時看向同一個方向的時候才會出現.我們的每只眼睛周圍有六塊肌肉,它們由大腦中的信號控制.你的兩只眼睛若是沒有對齊,那么你的大腦就會得到兩幅不同的圖像.隨著時間的流逝,這會造成更加嚴重的視力問題.不過你短暫地裝一下斗雞眼并不能達到這種效果.
MYTH #2. EATING CARROTS WILL HELP YOU SEE IN THE DARK.
誤解2：吃胡蘿卜能增強你的夜間視力
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.
其實胡蘿卜對你的視力沒有壞處,它們含有豐富的β-胡蘿卜素,隨后你的身體會將它們變成維他命A,這種維他命對視力至關重要.但胡蘿卜無法讓你的夜間視力變得超常.
MYTH #3: THE BIGGER YOUR EYES, THE BETTER YOUR EYESIGHT.
誤解3：你的眼睛越大,視力越好.
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.
人類剛出生的時候,眼球直徑約為16毫米,成年后會達到24毫米.但你的眼睛變大了并不意味著你的視力變強了.事實上,人類眼睛過度增長會造成近視.如果眼球太長,那么眼睛的晶狀體就無法將光線聚集在視網膜的正確位置,人類也無法接收到清晰的圖像.
