Tears are good for your eyes. In fact, without them, your eyes wouldn’t even be able to move. Some people say tears help us in other ways, too. Maybe you know someone who likes to watch sad movies in order to “have a good cry”. It hasn’t been proven, but tears may be good not only for your eyes but also for your emotional health as well.
We generally only notice tears when we cry, but we have them in our eyes all the time. Tears affect how we see the world while at the same time protecting our eyes from it. Without this liquid covering them, our eyes would be at risk of infection. In addition, we need tears in order to see. The cornea (角膜) of the eye does not have a perfectly smooth surface. Tears fill in the holes in the cornea and make it smooth so that we can see clearly. Without tears, the world would look very strange to us.
There are three types of tears, and they are called basal, reflex, and emotional tears. These three types are different not only in purpose but also in composition.
Tom Lutz, the author of Crying: The Natural and Cultural History of Tears, writes, “Throughout history, and in every culture, ... everyone everywhere cries at some time.” Even men and women who say they never cry can usually remember crying as children. Most of us probably think it’s normal for men or women to cry at certain times, and at such times, we may even encourage them to cry. For example, it’s no surprise when someone cries during a sad movie, and we often expect people to cry when a family member dies. However, we don’t always take this view of tears. Sometimes adults who cry — or even children who do — lose the respect of others. For example, what would you think of an adult who cried over losing a card game? Most people are aware of the social rules about when, where, and why it’s OK to cry. These rules generally differ for children and adults, and often for men and women. They depend on things such as family, culture, and religion, and they change over time.
Some people think it’s not just OK to cry but actually healthy to let the tears flow. Doctors in Greece over 2,500 years ago thought that tears came from the brain and that everyone needed to let them out. Today, many people still believe in getting tears out. They say that through crying, we get rid of emotions we have stored up, which is good for our mental health. Some people report that they feel better after crying. This could be because of the chemicals in emotional tears. One chemical is a type of endorphin, a painkiller that the body naturally produces. Emotional tears increase the amount of endorphin that gets to the brain because tears flow from the eye into the nose and pass to the brain that way. This painkiller may make a person less aware of sad or angry feelings, and that could explain why someone feels better after “a good cry”.
【小题1】When do we have tears in our eyes?
【小题2】How do tears help us see clearly?
【小题3】How many kinds of tears do we have?
【小题4】Please list at least two things that are related to the social rules of crying.
【小题5】In which country did doctors over 2,500 years ago believe that tears came from the brain?
