n.视力计；视力检定装置
Objective To introduce the structure and operating principle of a laser optometer for dark focus(DF). 目的:介绍了暗焦点检查仪的结构原理。
Objective To introduce the structure and operating principle of a laser optometer for dark focus (DF). 摘要目的：介绍了暗焦点检查仪的结构原理。
Results The laser optometer was proved to be a reliable instrument with fine stability and good repeatability. 结果:证明仪器稳定性及重复性好。
This paper introduces an electronic optometer based on SCM, which is convenient, rapid and accurate. 本文介绍了一种用单片机制作的视力计,具有方便、快捷、准确的特点。
Conclusion The laser optometer for dark focus can be used for further study relating to the aviation vision. 结论：可用于航空视觉方面的深入研究。
