The distance between the vision meter and the person being examined must be correctly fixed, with the patient being 5 meters from the meter. If the distance inside the room is not long enough for 5 meters, a plane mirror should be placed at 2.5 meters to reflect the meter.
Testing method: the test is performed by covering one eye first and identifying the direction of the "E" notch from top to bottom with one eye until it is not recognizable, and then recording it. Normal vision should be above 1.0.
If the test subject can not see 0.1, to move forward until you can see 0.1, the visual acuity is "0.1 × distance / 5 = visual acuity"; if you still can not see 0.1 in half a meter, you can make the test subject to recognize the index, measure manual, light sense, etc..
Record visual acuity according to the examination. Near vision with "J" near vision table, the same way to identify the "E" notch direction, until it can not be recognized, near distance can be adjusted on their own, normal near vision at 30 cm to see 1.0 line can be, near vision check helps diagnose refractive error.
Extended information1, myopia recovery
The vision obtained by wearing framed glasses, corneal contact lenses (OK lenses, a Class III medical device, which is a high-risk medical device), and laser surgical treatments, etc., is corrected vision, and is not a true restoration of the actual naked eye vision.
2, myopia recovery true and false myopia
Children and adolescents read books or games for a long time, such as close eye use, will lead to ciliary muscle spasm, but the eye did not occur pathological changes, this situation is usually called false myopia, if the fundus of the eye pathologic changes, it is called true myopia.
Both true myopia and pseudomyopia show a decrease in distance vision, but pseudomyopia shows positive vision after dilating the pupils with a ciliary muscle paralyzing agent, while true myopia continues to show a decrease in distance vision.
Pseudomyopia that is not eliminated in three months converts to true myopia.
Reference source Baidu Encyclopedia - Visual Acuity Chart: