英语听力文摘485 看不清？眯眼睛
眯眼睛真的有效吗?
Male: Thanks for coming on this fact-finding trip with me and share the driving.
Female: Glad to do it. It should be a fun trip. I imagine I will learn a lot.
M: I hope so. So i think we are getting close to our exit.So I'll keep an eye on it.For there is a sign but I can't quite make it out.
F: Donne, you're squinting to see the sign. Does that really help?
M: It really does. I can read it now when I am squinting.
F: Let's see now.Light enters the eye from many directions. The lens of the eye bends these rays so that they come together at a focal point. When the rays come together at the retina， the image is in focus. If this focal point is in front of the retina, close objects are clear–nearsightedness; if it is behind the retina, distant objects are clear– farsightedness.
M: Right.Now because they are bent more, the rays that pass near the edge of the pupil are blurred more. If you can eliminate these edge rays then you will have less blurring.
F: That must be what squinting does.
M: Exactly.Squinting uses the eyelids to block the blurred rays that enter the pupil near its edge. Squinting is not a long-term solution to poor vision, but it sometimes helps in a pinch.
M: Ah,I think we can end this field trip now.I've learned about all I can stand for one day.
男：谢谢你来跟同我一道进行实地考察。
女：很乐意!应该会很有趣的。我觉得我也会学到很多东西。
男：但愿如此!我想我们正在靠近出口了，所以我要集中精力，因为有个地方我总是辨别不出来。
女：多恩，你(眼睛)眯着看东西,真有帮助吗?
男：是的。当我眯着眼睛的时候就可以认出来。
女：让我们现在来看看。光线从四面八方进入到人的眼睛里，眼睛里的晶状体会使这些光线转向，好让它们聚集到同一焦点。当光线聚集到视网膜，清晰的图像就形成了。如果该聚焦点在视网膜前，进出的东西就会很清楚—— 即近视;如果在视网膜后，远处的东西就很清楚—— 即远视。
男：正确!现在由于它们太过倾斜了，经过瞳孔边缘的光线就会被模糊掉。如果你能消除这些边缘的光线，你就会看的清楚些。
女：那就是眯眼睛的效果。
男：完全正确。眯眼睛(的时候)，眼皮阻挡了进入瞳孔边缘地区的光线。可这只是在必要时有些帮助，并不是一个解决视力差的方法。
女：阿，我觉得我们现在可以结束这次旅程了。我已经学到了一天能承受的量了。
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