关于视力的几个常见误解 上
文章来源:未知 文章作者:enread 发布时间:2016-05-14 06:45 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
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.


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1 align fKeyZ     
vt.使成一线,结盟,调节;vi.成一线,结盟
参考例句:
  • Align the ruler and the middle of the paper.使尺子与纸张的中部成一条直线。
  • There are signs that the prime minister is aligning himself with the liberals.有迹象表明首相正在与自由党人结盟。
2 dilation 58fac7152c9934c2677139c81cdb697b     
n.膨胀,扩张,扩大
参考例句:
  • Time dilation works both ways. 时间膨胀在两方面都起作用。 来自辞典例句
  • The ciliary body is an anterior dilation of the choroid at the level of the lens. 晶状体是脉络膜石晶状体平面上向前扩大的部分。 来自辞典例句
3 cognitive Uqwz0     
adj.认知的,认识的,有感知的
参考例句:
  • As children grow older,their cognitive processes become sharper.孩子们越长越大,他们的认知过程变得更为敏锐。
  • The cognitive psychologist is like the tinker who wants to know how a clock works.认知心理学者倒很像一个需要通晓钟表如何运转的钟表修理匠。
4 cataracts a219fc2c9b1a7afeeb9c811d4d48060a     
n.大瀑布( cataract的名词复数 );白内障
参考例句:
  • The rotor cataracts water over the top of the machines. 回转轮将水从机器顶上注入。 来自《现代英汉综合大词典》
  • Cataracts of rain flooded the streets. 倾盆大雨弄得街道淹水。 来自辞典例句
5 prescription u1vzA     
n.处方,开药;指示,规定
参考例句:
  • The physician made a prescription against sea- sickness for him.医生给他开了个治晕船的药方。
  • The drug is available on prescription only.这种药只能凭处方购买。
6 permanently KluzuU     
adv.永恒地,永久地,固定不变地
参考例句:
  • The accident left him permanently scarred.那次事故给他留下了永久的伤疤。
  • The ship is now permanently moored on the Thames in London.该船现在永久地停泊在伦敦泰晤士河边。
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