Measurement method:<br>one<br>You can stick the vision test form on the wall first<br>Stick it four steps away from him<br>First, cover one eye and take turns testing the vision of the left and right eyes<br>And make records on the record sheet<br>two<br>Eat four with plain water<br>Wait for 30 minutes<br>Precautions within 30 minutes after eating:<br>1. Do not rub your eyes<br>2. Drink more water 400-500cc<br>3. Do not drink carbonated tea drinks<br>4. Don't take a shower, sleep, cook, don't smoke<br>5. Don't watch TV or mobile phones<br>three<br>Take another visual acuity test in 30 minutes<br>Take the same four big steps back<br>Keep a record for a week
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