To evaluate and compare the methods of epidemiologic clue investigation with the sample investigation in blindness and low vision.
目的：对盲与低力流行病线索与抽样调查方法进行比较、评价。
To evaluate and compare the methods of epidemiologic clue investigation with the sample investigation in blindness and low vision.
目的：对盲与低力流行病线索与抽样调查方法进行比较、评价。
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