Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学
基础定义出发，阐述光焦度和顶焦度差别，并对焦度
量原理和
差进行正
。
Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学基础定义出发，阐述光焦度和顶焦度差别，并对焦度量原理和差进行正。
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