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Idiom:
Run amuck( go crazy )
Hit the book：
Nearsightedness
Myopia
Prevalent
Contact
Clinical trial
Progression
Dose
Ophthalmology
Regress
Lots of people seem to need glasses these days. That's because nearsightedness, or myopia, is becoming increasingly prevalent around the world. More than 40 percent of Americans are nearsighted, up from just 25 percent in the 1970s. In developed Asian countries, that rate is even higher with nearly 90 percent of children developing myopia.
