However, Dr Sherwin said they would now need more precise data to try to understand which factors,

　　such as increased use of distance vision, reduced use of near vision, natural ultraviolet(紫外线的) light exposure(暴露) and physical activity,are most important.

　　“Any increase in time spent outdoors must be weighed against exposure to ultraviolet radiation and the increased risk of skin cancer, cataracts(白内障)and other cancers.”he said."On the other hand, increasing outdoor physical activity could protect against diabetes and obesity, for example."

　　Short-sightedness is a common eye condition that causes distant objects to appear blurred(模糊不清的), while close objects can be seen clearly. It is much more common today in the UK and the United States than it was just 30 to 40 years ago. Approximately 1-2% of five-year-olds to seven-year-olds in the UK have short-sightedness.About.five million British people are short-sighted and some 200,000 of them will be seriously short-sighted. In some parts of Asia, more than 80% of the population suffers from short-sightedness.

　　The passage mainly tells us

　　.

　　short-sightedness and its effects

　　some factors that affect one’s eyesight

　　more and more children become short-sighted

　　less time spent outdoors may mean more short-sightedness

　　The underlined word “precise” in the fifth paragraph shares the closest meaning with

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