It is stipulated that the normal vision is greater than or equal to 1.0, and the so-called 1.0 is 5.0 on the visual acuity chart. After the parallel light comes in, the retina falls on the retina, which is just one o'clock on the eye chart. This is normal vision. Of course, there are people who can reach 1.2 and 1.5, which is also the normal vision range, that is to say, 1.0 or above is called normal vision. Then normal vision should also be said that many people have myopia or hyperopia or astigmatism. At this time, his normal vision depends on corrected vision, not naked vision. If you don't wear glasses, it may be 0.2 or 0.3, then your vision will be abnormal at this time. If it is abnormal, it can reach 1.0 after correction with glasses, which means that this person's corrected vision is normal. So if it can reach 1.0 after correction, it is called normal vision. Expert tip: The specified normal vision is greater than or equal to 1.0, that is, 5.0 is seen on the eye chart. If you have myopia or hyperopia or astigmatism, normal vision depends on corrected vision, not naked vision. So if it can reach one point zero after correction, it is called normal vision.
The average person's vision will be above 1.0, and the normal vision of people over 5 years old should reach 1.0 (5.0). 2.0 is the previous standard, which is very good hyperopia, and 5.0 is the new standard commonly used now, which is equivalent to the previous 1.0. The best way to protect your eyesight is to look far and do more farsighted training, such as playing badminton. For example, reading and writing at close range, watching computer, etc. If it is unavoidable, it is suggested that the interval should be 40 minutes and the distance should be 10 minute. To prevent strabismus, as far as children are concerned, the gaze in one direction should be reduced too much, and adults have no preventive measures for strabismus.
Normal vision is above 5.0. 4.8' s vision is lower than normal.
4.8 The eyesight is a little lower than normal, but we should control our eyes, use less mobile phones and computers, and pay attention to eye hygiene.