Look around and you’ll see people busy on their smartphones. Smartphones do make our lives easier. But have you ever thought about what they mean to your eyes?
According to a study, half of British people own smartphones and they spend an average(平均) of two hours a day using them. There has been a 35% increase in the number of people in the UK who suffer from shortsightedness(近视) since smartphones were introduced there in 1997.
Staring(盯) at smartphones for long time gives you dry eyes. When looking at something in the distance, your eyes automatically blink(自动眨眼) a certain number of times. However, when you look at things closer to your face, the blinking slows down. This reduces the amount of tears and causes discomfort in your eyes. Another bad habit is using smartphones in dark rooms before going to sleep. If you look at a bright screen while your pupils(瞳孔) become larger, too much light enters your eyes. This can do harm to the eyes and cause a disease called glaucoma(青光眼).
While you’re probably not going to stop using to your smartphone, there are a few things you can do to protect your eyes. Hold your phone at least 30 centimetres away from your eyes when using it. Take a break every hour and try the following: look at something at least five meters from you and then focus on the tip of your nose. Repeat this several times. It should reduce the discomfort in your eyes.

The article is mainly about ________.

A．the harm that smartphones do to users’ eyes

B．the rules to obey when using smartphones

C．the reason why teenagers get shortsightedness

D．advantages and disadvantages of smartphones

From Paragraph 2, we learn that _______.

A．half of the British people began to smartphones 17years ago

B．each of the British people spends two hours a day on smartphones

C．more British people have got shortsightedness since 1997

D．the number of British people who own smartphones increases by 35%

According to Paragragh 3 , using smartphone improperly may cause ____

A．too many blinks	B．dry eyes and glaucoma
C．smaller pupils	D．more tears in the eyes

Which is the follow ing is duggested by the writer?

A．Don't use the phone for over an hour without a break

B．Hold the phone at least half an meter away from the eyes

C．Turn off your phone for a couple of hours every day

D．Look at the tip of your nose for several minutes.

This article is written to advise people ____

A．not to buy smartphone

B．to stop using smartphone

C．to make full use of smartphone

D．to use smartphone properly

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