First of all, we need to clarify a concept, the degree of myopia and the child’s vision are two completely different concepts, the degree and vision is not a one-to-one correspondence. Theoretically the perfect normal eye is 0 degrees, but in reality, there are very few people with exactly 0 degrees, and most people’s eyes are above and below 0 degrees (95-99% of the population is between 75 degrees of farsightedness and 50 degrees of myopia), but the human eye has a certain degree of regulation and compensatory ability, generally speaking, myopic people within 100 degrees of myopia when some people can still see the vision table Some people can see “1.0” or even “1.2” or “1.5”. For children, such adjustment and compensatory ability is stronger than that of adults, so that some shallow degrees of myopia are masked. Second, the standard of normal visual acuity is not the same for children of different ages. People are not born with orthoptic eyes, nor do they have 1.0 or even 1.5 vision at birth. Studies have found that infants are generally farsighted at birth, with their focus behind the retina, and the vision of a newborn is less than 0.1. However, as the infant’s eye develops, its focus slowly approaches the retina, and gradually focuses on the retina, gradually approaching 0 degrees, and the vision rises year by year, to become orthoptic (generally 1.0-1.5 vision) at school age, a process known as “orthokeratology. This process is called “orthokeratology”. Most children have different visual acuity at different stages of growth and development, and the child’s visual acuity should be adapted to the child’s daily use of the eyes. Generally speaking, a 1-year-old child has a small range of daily activities and does not need to focus on distant targets or use the eyes at close range. The normal visual acuity of a 1-year-old child is about 0.2, with a refraction of +2.00D to +3.00D (about 300 degrees of farsightedness) and an eye axis length of about 20 mm. A 2-3-year-old child begins to focus on toys in front of him or her and more distant targets, with a visual acuity of about 0.3 to 0.5. 0.5, with a refraction of about +1.50D to +2.50D (about 150-250 degrees of hyperopia) and an eye axis length of about 21.5mm. At the age of 4-6, children begin to enter pre-kindergarten classes, where the range of activities is further expanded, the focus is on more distant and near targets, and their visual acuity develops to about 0.6-0.8, with a refraction of about +0.75D to +1.50D (about 150-250 degrees of hyperopia) and an eye axis length of about 21.5mm. 1.50D (about 75-150 degrees of hyperopia) and an eye axis length of about 22.5mm. At the age of 7, the child starts school, the range of daily activities is close to that of an adult, the eye development basically reaches orthoptics, the visual acuity is about 0.8-0.9 or even more than 0.9, and the refraction of the dilated pupil is about 0 to +0.75D (less than 75 degrees of hyperopia) and the eye axis length is about 23.0mm. If this process If this process is delayed, the child will be prone to future hyperopia and amblyopia. If this process progresses too quickly, the child is likely to become myopic in the future. For example, a 3-year-old child who has the 1.0 vision of a 7-year-old child and an eye axis length of a 7-year-old child is “nearsighted” relative to children of the same age. In addition, children’s eyes are growing and developing, and the structures in the eyes are not fully stabilized. Although the speed and degree of extension of the eye axis of some children exceeds that of their normal peers, it is still possible for children to see 1.0 vision if the curvature of the cornea is flat or if the lens morphology is abnormal to compensate for the refractive error caused by the extension of the eye axis. Conversely, some children may not see “1.0” on their vision chart, and their daily undilated eye exams may indicate mild “myopia”, but after the child is given dilating medication to dilate the pupil, another exam may indicate mild hyperopia or 0, and the child’s eye axis is of normal length. This excludes other eye abnormalities. The child may have “regulatory myopia”, which may disappear if he/she improves his/her eye habits or uses eye drops to relieve the regulatory spasm. Therefore, the child’s visual acuity does not tell the whole story, but the child’s age, visual acuity, refractive error (subject to dilated eye examinations), eye axis length, corneal curvature, etc. should be taken into account to determine whether the child is myopic.