When we see well，we do not think ab

当我们看得很好时，我们就不会经常思考眼睛。只有当我们看不到完美的眼睛时，我们才意识到眼睛的重要性。<br>近视的人只能看到非常靠近眼睛的东西，其他一切似乎都模糊（=不清楚）。许多从事很多工作（例如写作，阅读和缝纫）的人都近视了。<br>有远见的人会遇到相反的问题。他们可以看到很远的东西，但是除非一臂之力，否则他们很难读书。如果想读书，他们必须戴眼镜。 ，太。<br>其他人因为眼睛的形状不正确而看不清。他们有所谓的散光（散光）。也可以通过眼镜来矫正。有些人的眼睛由于白内障（白内障）而变得混浊。很久以前这些人经常变得盲目。然而，现在有可能对白内障进行手术并清除它们。<br>拥有两只好眼睛对于判断距离很重要。每只眼睛从略微不同的角度（角度）看事物。要向自己证明这一点，请用一只眼睛注视一个对象，然后用另一只眼睛注视同一对象。您会发现对象与背景的关系以及周围的其他事物都发生了变化。这两种不同的视角之间的差异有助于我们判断对象的距离。只有一只眼睛的人无法判断距离，因为两只眼睛的人。

When we see well，we do not think about our eyes very often．It is only when we cannot see perfectly that we realize how important our eyes are．<br>People who are near-sighted can only see things that are very close to their eyes，Everything else seems blurry（=unclear）．Many people who do a lot of work，such as writing，reading and sewing become near-sighted．<br>People who are far-sighted suffer from just the opposite problem．They can see things that are far away，but they have difficulty in reading a book unless they hold it at arm's length．If they want to do much reading，they must get glasses，too．<br>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．<br>Having two good eyes is important for judging distances．Each eye sees things from a slightly different angle （角度）．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 distance as people with two eyes．

当我们看得好的时候，我们不会经常去想我们的眼睛，只有当我们看不清楚的时候，我们才意识到我们的眼睛是多么的重要。<br>近视的人只能看到离眼睛很近的东西，其他的东西似乎都模糊不清。许多做很多工作的人，如写作、阅读和缝纫，都会变成近视。<br>有远见卓识的人正面临着相反的问题。他们能看到很远的东西，但是他们很难阅读一本书，除非他们把它保持在臂长的地方。如果他们想读很多书，他们也必须戴眼镜。<br>其他人看不清楚，因为他们的眼睛形状不完全正确。他们有所谓的散光（散光）。这也可以用眼镜矫正。有些人的眼睛因为白内障而变得混浊。很久以前，这些人经常失明。然而，现在有可能在白内障摘除。<br>拥有两只好眼睛对于判断距离很重要。每只眼睛从一个稍微不同的角度看事物（角度）。为了证明这一点，你可以用一只眼睛看一个物体，然后用另一只眼睛看同一个物体。你会发现这个物体与背景的关系和它周围的其他事物都发生了变化这两种不同的视角有助于我们判断一个物体的距离。只有一只眼睛的人不能像有两只眼睛的人那样判断距离。