IOR - also known as Index of Refraction, a physical parameter of transparent matter that defines how strong a ray gets bent when entering media of different density.
折射度-物理参数，表现折射物体的光折射特性，光线穿过某不同密度物质所应改变方向的角度。
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This paper put forward a scheme, in which regarding refraction coefficient as systematic parameter introduced into adjustment model for compensation.