数字频率计是一种基本的测量仪器。
The digital cymometer is a kind of basic measuring instrument.
数字频率计是近代电子技术领域的重要测量工具之一，同时也是其他许多领域广泛应用的测量仪器。
Digital cymometer is one of the important measurement tools in the field of modern electronic technology, it is also widely used in many other areas of the measuring instruments.
方法：在实验室搭建实验装置，分别利用矩形光栅法的实验装置和平板法视网膜MTF测量仪器，来测定正视眼组和屈光不正组的不同空间频率条纹分辨的阈值，算出并分析比较所测MTF值。
METHODS: Retina MTF of two groups of people with emmetropia and ametropia were measured by means of a grating and parallel plate respectively. Then the measured MTF were compared and analyzed.
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