Schools and parents in Shenzhen City have been asked to take better care of children's eyesight as 45 percent of them were found to be shortsighted. Too much reading, poor lighting and too much TV are blamed . Of the city's high school graduates  who applied to study at colleges this summer, but now he gets up earlier. Only  _   of the children in Shenzhen City have good eyesight.
45 percent less than half 55 percent two thirds