Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学的基础定义出
，
光焦度和顶焦度的差别，并对焦度计的测量原理和
差进行正确分析。
Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学的基础定义出，光焦度和顶焦度的差别，并对焦度计的测量原理和差进行正确分析。
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