结果：近视眼按病变性质分类，以单纯性近视占绝大多数；
Results:By the classification of the causes of myopia, the simple myopia constitutes the majority.
结果：按病变性质分类，以单纯性近视占绝大多数（803例）；
Results: According to the property of myopia, more cases had simple myopia(803 cases);
多元线性回归和相关分析显示眼球轴长增加是单纯性近视眼形成的主要因素。
Multiple linear regression and correlative analysis showed that the increase in optic axis was main factor for the formation of simple myopia of teenager.
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