Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts (白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them.

　　Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself, look at an object out of one eye; then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distances as people with two eyes.

　　41. We should take good care of our eyes

　　.

　　A. only when we can see well

　　B. only when we cannot see perfectly

　　C. even if we can see well

　　D. only when we realize how important our eyes are

　　42.When things far away seem indistinct(模糊不清) , one is probably

　　.

　　A. near-sighted

　　B. far-sighted

　　C. astigmatic

　　D. suffering from cataracts

　　43. The underlined word blurry in the second paragraph probably means

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