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【英文原文】
How to keep your eyesight sharp
１. Boost your beta carotene intake. Eat lots of oranges and yellow fruits and vegetables such as spinach.
２. Eat other carotenoids too. Beta carotene is only one of more than ５００members of the carotenoid family. A study also suggests that carotenoids found in green leafy vegetables（such as broccoli and kale）may help prevent vision loss.
３. Stay active. A study found that people who bicycled four times a week for ４０minutes had a ２０percent drop in eye pressure.
４. Block the sun. Some studies link long-term exposure to ultraviolet rays（UV）to cataract formation. To protect your eyes, wear sunglasses with a special coating that locks UV light.
５. Stop smoking. According to a study, people who smoke 35 or more cigarettes a day have a 63 percent greater risk of developing cataracts.
