Check vision is generally divided into distance vision and near vision. In my country, the standard logarithmic vision chart is mainly used (the second generation has been implemented in May 2012). This chart contains 12 rows of "E" with different opening directions in different sizes and sizes. "", measuring from 0.1-1.5 (or 4.0-5.2); each line is marked, the line of sight of the examinee should be parallel to the line of 1.0, 5 meters away from the eye chart, the distance between the eye chart and the examinee must Properly fixed, the patient is 5 meters away from the table. If the indoor distance is less than 5 meters long, a flat mirror should be placed at 2.5 meters to reflect the eye chart. To perform the test, cover one eye first, and recognize the direction of the "E" notch with one eye from top to bottom until it can't be recognized, just record it. Normal vision should be above 1.0. If the subject cannot see 0.1, move forward until he can see 0.1, his vision is "0.1×distance/5=visual acuity"; if he still cannot see 0.1 within half a meter, he can be The tester's identification index, measuring manual, light perception, etc. Record the vision according to the inspection. Use the "J" near vision chart for near vision. Use the same method to identify the direction of the "E" gap until you can't recognize it. It can be adjusted at close range. Normal near vision can see 1.0 line clearly at 30 cm. Near vision check is helpful. For the diagnosis of refractive error.