關于視力的幾個常見誤解 上
文章來源:未知 文章作者:enread 發布時間:2016-05-14 06:45 字體: [ ]  進入論壇
(單詞翻譯:雙擊或拖選)
MYTH #1: IF YOU CROSS YOUR EYES, THEY'LL STAY THAT WAY.
 
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 align1, 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.
 
MYTH #2. EATING CARROTS WILL HELP YOU SEE IN THE DARK.
 
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.
 
MYTH #3: THE BIGGER YOUR EYES, THE BETTER YOUR EYESIGHT.
 
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.
 
MYTH #4: PUPIL DILATION2 OCCURS ONLY IN RESPONSE TO CHANGES IN LIGHT.
 
Sexual arousal, solving a complicated mental math problem, fear, and other cognitive3 and emotional events can provoke changes in pupil size, though the precise reasons why are not yet clearly understood.
 
MYTH #5: UV RAYS CAN ONLY DAMAGE EYES WHEN THE SUN IS SHINING.
 
Even on cloudy and foggy days, ultraviolet (UV) radiation can cause eye damage. Years of exposure can increase your risk of developing cataracts4.
 
MYTH #6: WEARING GLASSES TOO MUCH CAN MAKE YOUR EYESIGHT WORSE.
 
Giving the correct prescription5 "reduces the progression of myopia."
 
MYTH #7: READING IN DIM LIGHT WILL DIMINISH YOUR EYESIGHT.
 
While reading in semi-darkness may put a temporary strain on your eyes, it's not going to permanently6 damage your eyesight.


點擊收聽單詞發音收聽單詞發音  

1 align fKeyZ     
vt.使成一線,結盟,調節;vi.成一線,結盟
參考例句:
  • Align the ruler and the middle of the paper.使尺子與紙張的中部成一條直線。
  • There are signs that the prime minister is aligning himself with the liberals.有跡象表明首相正在與自由黨人結盟。
2 dilation 58fac7152c9934c2677139c81cdb697b     
n.膨脹,擴張,擴大
參考例句:
  • Time dilation works both ways. 時間膨脹在兩方面都起作用。 來自辭典例句
  • The ciliary body is an anterior dilation of the choroid at the level of the lens. 晶狀體是脈絡膜石晶狀體平面上向前擴大的部分。 來自辭典例句
3 cognitive Uqwz0     
adj.認知的,認識的,有感知的
參考例句:
  • As children grow older,their cognitive processes become sharper.孩子們越長越大,他們的認知過程變得更為敏銳。
  • The cognitive psychologist is like the tinker who wants to know how a clock works.認知心理學者倒很像一個需要通曉鐘表如何運轉的鐘表修理匠。
4 cataracts a219fc2c9b1a7afeeb9c811d4d48060a     
n.大瀑布( cataract的名詞復數 );白內障
參考例句:
  • The rotor cataracts water over the top of the machines. 回轉輪將水從機器頂上注入。 來自《現代英漢綜合大詞典》
  • Cataracts of rain flooded the streets. 傾盆大雨弄得街道淹水。 來自辭典例句
5 prescription u1vzA     
n.處方,開藥;指示,規定
參考例句:
  • The physician made a prescription against sea- sickness for him.醫生給他開了個治暈船的藥方。
  • The drug is available on prescription only.這種藥只能憑處方購買。
6 permanently KluzuU     
adv.永恒地,永久地,固定不變地
參考例句:
  • The accident left him permanently scarred.那次事故給他留下了永久的傷疤。
  • The ship is now permanently moored on the Thames in London.該船現在永久地停泊在倫敦泰晤士河邊。
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