Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光
础定义出发，阐述光焦度和顶焦度差别，并对焦度计测量原理和
差进行正确
析。
Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光础定义出发，阐述光焦度和顶焦度差别，并对焦度计测量原理和差进行正确析。
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