试论我国眼镜片屈光值的基准传递和测量

Preliminary Discussion on Reference Transfer and Measurement of Vertex Power of Chinese Spectacles

本文从镜度仪的光学设计原理和有关各国眼镜片的基准弯度,提出作为校正和检定镜度仪精度的基准屈光值镜片之内侧面弯度为-6 D。基准值镜片接触面曲率不同,会产生原理误差。本文还提出测试基准屈光值的方法和仪器,根据眼镜片内顶点屈光度的定义,在光具座上测定顶焦距l_f′的倒数值比直接测试要正确。

Based on the optical principle to design the lensmeter and the reference curvature of spectacle of many countries, it is suggested that the curvature of back surface of reference dioper spectacle, which is used to corret and assay the precision of lensmeter, should be-6D. The curvature differences of back surfaces of reference spectacles will cause theoretical error.The me thod and instrument for measuring reference diopter are also discussed.According to the definition of vertex power, to measure the reciprocal of vertex focal length on an optical bench will be more accurate than measuring directly.