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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。
In this paper, the optical design principle of the speculum and the reference curvature of the relevant ophthalmic lenses in the country are put forward. The medial curvature of the lens is -6D as the reference refractive power of the accuracy of the corrective and verification speculum. The reference lens contact surface curvature, will have a principle error. This paper also proposed methods and instruments for testing the reference refractive power. According to the definition of the vertex refraction in the ophthalmic lens, it is better to measure the reciprocal of the top focal length l_f ’than the direct test in the optical bench.