Hello, you can buy an eye chart and test it at home. The distance between the eye chart and the eye chart is 5 meters. The height of the eye chart should be 1.0 (or logarithmic eye chart 5.0), and the target should be parallel to the eyes of the subject. Lighting should be appropriate. Generally, the vision examination is performed right and then left, and the eyes are performed separately. When examining one eye, cover it with the other eye. Eyes must be wide open, not squint, squint or tilt.
It is suggested that where optical shops can be sold, there should be free examination or optometry in ophthalmology to avoid eye fatigue and often do eye exercises.