目的：探讨接触镜的球差特征以及后顶焦距测量的实质。

Objective: To analyze the aberration properties of contact lens and its central back vertex power measurement.

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目的了解不同类型的髋关节假体柄与骨的接触面积，并探讨接触面积的大小与假体松动的关系。

Objective to elucidate the contact areas of stem-bone of the different type prostheses and probe into the relation between the contact areas and prosthesis loosening.

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目的探讨制鞋业工人接触胶粘剂后个性特征的变化及影响因素。

Objective to study the change of personality characteristics and its influence factors of shoe workers after contacting adhesives.

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