Your Eyes原版英文小故事MP3音频免费下载

Your Eyes原版英文小故事内容：

Light goes through the pupil, the dark hole in the center of your eye. Thelight becomes an image on the retina, which converts these images intonerve impulses. The brain reads these impulses and “tells” you what youare seeing. The image that the retina receives is upside down, but thebrain reverses it to right-side up.

In an experiment years ago, a brave researcher wore special lenses thatturned everything upside down. After stumbling around for awhile, hebecame used to the lenses because his brain corrected the images. Toconclude his experiment, he stopped wearing the lenses. After awhile, hisbrain returned his vision to normal.

People with vision problems are usually near-sighted or far-sighted. Nea-sighted people see clearly only objects that are near; far-sighted peoplesee clearly only objects that are far away. Both groups of people needcorrective lenses (glasses or contacts).

People whose near and far vision is good have “20/20” vision. Peoplewith poor eyesight might have 20/40 vision (or worse). That is, a personwith good vision can see an object from 40 feet away as clearly as aperson with poor vision can see the object from 20 feet away. No matterhow good your vision is when you are young, you will need reading glasseswhen you get old.

Your pupils get bigger as a light source gets dimmer, but your pupils alsoget bigger if you see something (like a delicious meal) that interestsyou. “Your eyes are bigger than your stomach” is an expression parentsuse when a child fills his plate with more food than he can eat.