1. Results The optometer has the merits of simple manipulation, exact result, small cubage, AC/DC power supply and so on. Besides, it prevents the testee from remembering eye-chart.

2. Conclusion The optometer can be extensively used in hospital, school, every work unit or even family.

3. This paper introduces an electronic optometer based on SCM, which is convenient, rapid and accurate.

4. Conclusion The laser optometer for dark focus can be used for further study relating to the aviation vision.

5. Objective To discuss the principle and clinical application of microcomputer optometer.

6. Objective To introduce the structure and operating principle of a laser optometer for dark focus (DF).