目的：探讨不同混合比例聚甲基丙烯酸甲酯的力学性能差异。
OBJECTIVE: To explore mechanical property difference in the different mixing ratio of PMMA.
两组差异分析采用线性混合模型分析法。
Group differences were analyzed using linear mixed models analysis.
目的：探讨假性近视、真性近视、混合近视正相对调节差异。
AIM: To observe the differences of positive relative accommodation of pseudomyopia, true myopia and mixed myopia.
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