微计算机控制视力检测仪的研制

目的：研制新型微计算机控制的视力检测仪。方法：硬件采用AT89C51型单片机，软件采用C语言编程，显示部分采用液晶（LCD）显示，以国际标准视力表“E”字为视标，视标共14行，每屏显示1行，随机显示字符，视力检查距离为3m，全部程序在单片机控制下完成。结果：防止了人为记忆视力表的现象，检测操作简单，被检测者只需选择键盘上的按键就能完成视力检测。结论：淘汰了用于提升检查距离的平面镜，可存储和打印检测结果；仪器体积小，制作精密，使用方便，成本低，可由交、直流两用电源供电。

Development of Optometer Controlled by Micro-computer

Objective To develop a new optometer controlled by micro-computer.Methods With AT89C51 single-chip as hardware and programmed by C language,the instrument applied,the optometer adopted LCD and international standard optotype.The optotype had 14 lines of object-finders,and only one line of random characters was displayed on the screen every time.The optometry distance was 3m.All procedures were controlled by singlechip.Results The case of memorizing eye-chart was avoided and the optometry was every simple.Conclusion The instrument eliminates mirror used for optometry short distance,and the optometry results can be stored and printed.It also has the merits of small volume,precise manufacture,simple operation,low cost and AC/DC power supply.