方法：采用分组，随机的调查方法，对和林格尔县的眼病和主要致盲原因进行调查。
Methods: a random and grouped method was used to investigate the main cause of eye disease and blindness in Helinger County.
前言：目的：视觉2 020行动是于1999年发起的，目前与之相关的许多项目在进行中，为了配合这一行动，乃调查和林格尔县主要眼病和致盲原因。
Objective: Vision 2020 is launched in 1999, currently a lot of program is undergoing accompany with this program, so as to investigate the main cause of eye disease and blindness in Helinger County.
前言：目的：视觉2 020行动是于1999年发起的，目前与之相关的许多项目在进行中，为了配合这一行动，乃调查和林格尔县主要眼病和致盲原因。
Objective: Vision 2020 is launched in 1999, currently a lot of program is undergoing accompany with this program, so as to investigate the main cause of eye disease and blindness in Helinger County.
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